diff --git a/CHANGELOG.md b/CHANGELOG.md
index 509a16c6..1fe6711d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+- Add derived for object & simple object & complex object. [#667](https://github.com/async-graphql/async-graphql/pull/667) [#670](https://github.com/async-graphql/async-graphql/pull/670)
+- Respect query object field order. [#612](https://github.com/async-graphql/async-graphql/issues/612)
+
 ## [2.10.5] 2021-10-22
 
 - Bump poem from `0.6.6` to `1.0.7`. 
diff --git a/derive/src/complex_object.rs b/derive/src/complex_object.rs
index 105d2ee8..8d282690 100644
--- a/derive/src/complex_object.rs
+++ b/derive/src/complex_object.rs
@@ -85,8 +85,7 @@ pub fn generate(
                                     _ => Some(Err(Error::new_spanned(
                                         &pat,
                                         "Must be a simple argument",
-                                    )
-                                    .into())),
+                                    ))),
                                 },
                                 FnArg::Receiver(_) => None,
                             })
diff --git a/derive/src/input_object.rs b/derive/src/input_object.rs
index cd7680d7..228938e3 100644
--- a/derive/src/input_object.rs
+++ b/derive/src/input_object.rs
@@ -231,7 +231,7 @@ pub fn generate(object_args: &args::InputObject) -> GeneratorResult<TokenStream>
                 }
 
                 fn to_value(&self) -> #crate_name::Value {
-                    let mut map = ::std::collections::BTreeMap::new();
+                    let mut map = #crate_name::indexmap::IndexMap::new();
                     #(#put_fields)*
                     #crate_name::Value::Object(map)
                 }
@@ -272,7 +272,7 @@ pub fn generate(object_args: &args::InputObject) -> GeneratorResult<TokenStream>
                 }
 
                 fn __internal_to_value(&self) -> #crate_name::Value where Self: #crate_name::InputType {
-                    let mut map = ::std::collections::BTreeMap::new();
+                    let mut map = #crate_name::indexmap::IndexMap::new();
                     #(#put_fields)*
                     #crate_name::Value::Object(map)
                 }
diff --git a/derive/src/object.rs b/derive/src/object.rs
index 940ac4f4..6cfe0b79 100644
--- a/derive/src/object.rs
+++ b/derive/src/object.rs
@@ -100,8 +100,7 @@ pub fn generate(
                                     _ => Some(Err(Error::new_spanned(
                                         &pat,
                                         "Must be a simple argument",
-                                    )
-                                    .into())),
+                                    ))),
                                 },
                                 FnArg::Receiver(_) => None,
                             })
diff --git a/derive/src/simple_object.rs b/derive/src/simple_object.rs
index 1750e0b8..784f46d9 100644
--- a/derive/src/simple_object.rs
+++ b/derive/src/simple_object.rs
@@ -53,7 +53,7 @@ pub fn generate(object_args: &args::SimpleObject) -> GeneratorResult<TokenStream
     // Before processing the fields, we generate the derivated fields
     for field in &s.fields {
         processed_fields.push(SimpleObjectFieldGenerator {
-            field: &field,
+            field,
             derived: None,
         });
 
@@ -66,7 +66,7 @@ pub fn generate(object_args: &args::SimpleObject) -> GeneratorResult<TokenStream
                 let derived = DerivedFieldMetadata { ident: name, into };
 
                 processed_fields.push(SimpleObjectFieldGenerator {
-                    field: &field,
+                    field,
                     derived: Some(derived),
                 })
             }
diff --git a/derive/src/subscription.rs b/derive/src/subscription.rs
index 7c304300..b4a7b908 100644
--- a/derive/src/subscription.rs
+++ b/derive/src/subscription.rs
@@ -375,7 +375,7 @@ pub fn generate(
                                 };
                                 #crate_name::futures_util::pin_mut!(resolve_fut);
                                 let mut resp = query_env.extensions.resolve(ri, &mut resolve_fut).await.map(|value| {
-                                    let mut map = ::std::collections::BTreeMap::new();
+                                    let mut map = #crate_name::indexmap::IndexMap::new();
                                     map.insert(::std::clone::Clone::clone(&field_name), value.unwrap_or_default());
                                     #crate_name::Response::new(#crate_name::Value::Object(map))
                                 })
diff --git a/src/http/playground_source.rs b/src/http/playground_source.rs
index 3a6d2278..952330fd 100644
--- a/src/http/playground_source.rs
+++ b/src/http/playground_source.rs
@@ -624,7 +624,7 @@ impl<'a> GraphQLPlaygroundConfig<'a> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use std::collections::BTreeMap;
+    use indexmap::IndexMap;
 
     #[test]
     fn test_with_setting_can_use_any_json_value() {
@@ -634,7 +634,7 @@ mod tests {
             .with_setting("number", 10)
             .with_setting("null", Value::Null)
             .with_setting("array", Vec::from([1, 2, 3]))
-            .with_setting("object", BTreeMap::new());
+            .with_setting("object", IndexMap::new());
 
         let json = serde_json::to_value(settings).unwrap();
         let settings = json["settings"].as_object().unwrap();
diff --git a/src/resolver_utils/container.rs b/src/resolver_utils/container.rs
index dfe30795..d0dc3048 100644
--- a/src/resolver_utils/container.rs
+++ b/src/resolver_utils/container.rs
@@ -1,7 +1,8 @@
-use std::collections::BTreeMap;
 use std::future::Future;
 use std::pin::Pin;
 
+use indexmap::IndexMap;
+
 use crate::extensions::ResolveInfo;
 use crate::parser::types::Selection;
 use crate::registry::MetaType;
@@ -74,7 +75,7 @@ pub async fn resolve_container_serial<'a, T: ContainerType + ?Sized>(
     resolve_container_inner(ctx, root, false).await
 }
 
-fn insert_value(target: &mut BTreeMap<Name, Value>, name: Name, value: Value) {
+fn insert_value(target: &mut IndexMap<Name, Value>, name: Name, value: Value) {
     if let Some(prev_value) = target.get_mut(&name) {
         if let Value::Object(target_map) = prev_value {
             if let Value::Object(obj) = value {
@@ -118,7 +119,7 @@ async fn resolve_container_inner<'a, T: ContainerType + ?Sized>(
         results
     };
 
-    let mut map = BTreeMap::new();
+    let mut map = IndexMap::new();
     for (name, value) in res {
         insert_value(&mut map, name, value);
     }
diff --git a/src/response.rs b/src/response.rs
index 1a3fea0a..d851cca9 100644
--- a/src/response.rs
+++ b/src/response.rs
@@ -98,6 +98,7 @@ impl Response {
 }
 
 /// Response for batchable queries
+#[allow(clippy::large_enum_variant)]
 #[derive(Debug, Serialize)]
 #[serde(untagged)]
 pub enum BatchResponse {
diff --git a/src/types/external/json_object/btreemap.rs b/src/types/external/json_object/btreemap.rs
index c3f14660..bfaff892 100644
--- a/src/types/external/json_object/btreemap.rs
+++ b/src/types/external/json_object/btreemap.rs
@@ -2,6 +2,8 @@ use std::collections::BTreeMap;
 use std::fmt::Display;
 use std::str::FromStr;
 
+use indexmap::IndexMap;
+
 use crate::{
     InputType, InputValueError, InputValueResult, Name, OutputType, Scalar, ScalarType, Value,
 };
@@ -33,7 +35,7 @@ where
     }
 
     fn to_value(&self) -> Value {
-        let mut map = BTreeMap::new();
+        let mut map = IndexMap::new();
         for (name, value) in self {
             map.insert(Name::new(name.to_string()), value.to_value());
         }
diff --git a/src/types/external/json_object/hashmap.rs b/src/types/external/json_object/hashmap.rs
index d805f6ca..9fcc1f05 100644
--- a/src/types/external/json_object/hashmap.rs
+++ b/src/types/external/json_object/hashmap.rs
@@ -1,8 +1,10 @@
-use std::collections::{BTreeMap, HashMap};
+use std::collections::HashMap;
 use std::fmt::Display;
 use std::hash::Hash;
 use std::str::FromStr;
 
+use indexmap::IndexMap;
+
 use crate::{
     InputType, InputValueError, InputValueResult, Name, OutputType, Scalar, ScalarType, Value,
 };
@@ -34,7 +36,7 @@ where
     }
 
     fn to_value(&self) -> Value {
-        let mut map = BTreeMap::new();
+        let mut map = IndexMap::new();
         for (name, value) in self {
             map.insert(Name::new(name.to_string()), value.to_value());
         }
diff --git a/tests/preserve_order.rs b/tests/preserve_order.rs
new file mode 100644
index 00000000..f4aa96bd
--- /dev/null
+++ b/tests/preserve_order.rs
@@ -0,0 +1,60 @@
+use async_graphql::*;
+
+#[tokio::test]
+pub async fn test_preserve_order() {
+    #[derive(SimpleObject)]
+    struct Root {
+        a: i32,
+        b: i32,
+        c: i32,
+    }
+
+    let schema = Schema::new(Root { a: 1, b: 2, c: 3 }, EmptyMutation, EmptySubscription);
+    assert_eq!(
+        schema
+            .execute("{ a c b }")
+            .await
+            .into_result()
+            .unwrap()
+            .data,
+        value!({
+            "a": 1, "c": 3, "b": 2
+        })
+    );
+    assert_eq!(
+        serde_json::to_string(
+            &schema
+                .execute("{ a c b }")
+                .await
+                .into_result()
+                .unwrap()
+                .data
+        )
+        .unwrap(),
+        r#"{"a":1,"c":3,"b":2}"#
+    );
+
+    assert_eq!(
+        schema
+            .execute("{ c b a }")
+            .await
+            .into_result()
+            .unwrap()
+            .data,
+        value!({
+            "c": 3, "b": 2, "a": 1
+        })
+    );
+    assert_eq!(
+        serde_json::to_string(
+            &schema
+                .execute("{ c b a }")
+                .await
+                .into_result()
+                .unwrap()
+                .data
+        )
+        .unwrap(),
+        r#"{"c":3,"b":2,"a":1}"#
+    );
+}
diff --git a/value/Cargo.toml b/value/Cargo.toml
index f3949a73..0d0f1374 100644
--- a/value/Cargo.toml
+++ b/value/Cargo.toml
@@ -15,3 +15,4 @@ categories = ["network-programming", "asynchronous"]
 serde_json = "1.0.64"
 serde = { version = "1.0.125", features = ["derive"] }
 bytes = { version = "1.0.1", features = ["serde"] }
+indexmap = { version = "1.7.0", features = ["serde"] }
diff --git a/value/src/deserializer.rs b/value/src/deserializer.rs
index e473cae1..e0cf01e7 100644
--- a/value/src/deserializer.rs
+++ b/value/src/deserializer.rs
@@ -1,6 +1,7 @@
-use std::collections::BTreeMap;
 use std::{fmt, vec};
 
+use indexmap::IndexMap;
+
 use crate::{ConstValue, Name};
 
 use serde::de::{
@@ -78,7 +79,7 @@ where
 }
 
 fn visit_object<'de, V>(
-    object: BTreeMap<Name, ConstValue>,
+    object: IndexMap<Name, ConstValue>,
     visitor: V,
 ) -> Result<V::Value, DeserializerError>
 where
@@ -365,13 +366,13 @@ impl<'de> SeqAccess<'de> for SeqDeserializer {
 }
 
 struct MapDeserializer {
-    iter: <BTreeMap<Name, ConstValue> as IntoIterator>::IntoIter,
+    iter: <IndexMap<Name, ConstValue> as IntoIterator>::IntoIter,
     value: Option<ConstValue>,
 }
 
 impl MapDeserializer {
     #[inline]
-    fn new(map: BTreeMap<Name, ConstValue>) -> Self {
+    fn new(map: IndexMap<Name, ConstValue>) -> Self {
         MapDeserializer {
             iter: map.into_iter(),
             value: None,
diff --git a/value/src/lib.rs b/value/src/lib.rs
index fd44e9e6..c04da07f 100644
--- a/value/src/lib.rs
+++ b/value/src/lib.rs
@@ -10,7 +10,6 @@ mod value_serde;
 mod variables;
 
 use std::borrow::{Borrow, Cow};
-use std::collections::BTreeMap;
 use std::convert::{TryFrom, TryInto};
 use std::fmt::{self, Display, Formatter, Write};
 use std::iter::FromIterator;
@@ -18,9 +17,12 @@ use std::ops::Deref;
 use std::sync::Arc;
 
 use bytes::Bytes;
+use indexmap::IndexMap;
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 
 pub use deserializer::{from_value, DeserializerError};
+#[doc(hidden)]
+pub use indexmap;
 pub use serde_json::Number;
 pub use serializer::{to_value, SerializerError};
 
@@ -139,7 +141,7 @@ pub enum ConstValue {
     /// A list of values.
     List(Vec<ConstValue>),
     /// An object. This is a map of keys to values.
-    Object(BTreeMap<Name, ConstValue>),
+    Object(IndexMap<Name, ConstValue>),
 }
 
 impl PartialEq for ConstValue {
@@ -254,8 +256,8 @@ impl<T: Into<ConstValue>> From<Vec<T>> for ConstValue {
     }
 }
 
-impl From<BTreeMap<Name, ConstValue>> for ConstValue {
-    fn from(f: BTreeMap<Name, ConstValue>) -> Self {
+impl From<IndexMap<Name, ConstValue>> for ConstValue {
+    fn from(f: IndexMap<Name, ConstValue>) -> Self {
         ConstValue::Object(f)
     }
 }
@@ -364,7 +366,7 @@ pub enum Value {
     /// A list of values.
     List(Vec<Value>),
     /// An object. This is a map of keys to values.
-    Object(BTreeMap<Name, Value>),
+    Object(IndexMap<Name, Value>),
 }
 
 impl Value {
diff --git a/value/src/macros.rs b/value/src/macros.rs
index d39da636..4be7cc12 100644
--- a/value/src/macros.rs
+++ b/value/src/macros.rs
@@ -191,7 +191,7 @@ macro_rules! value_internal {
 
     ({ $($tt:tt)+ }) => {
         $crate::ConstValue::Object({
-            let mut object = std::collections::BTreeMap::new();
+            let mut object = $crate::indexmap::IndexMap::new();
             $crate::value_internal!(@object object () ($($tt)+) ($($tt)+));
             object
         })
@@ -227,7 +227,7 @@ macro_rules! value_expect_expr_comma {
 #[cfg(test)]
 mod tests {
     use crate::{ConstValue, Name};
-    use std::collections::BTreeMap;
+    use indexmap::IndexMap;
 
     #[test]
     fn test_macro() {
@@ -254,7 +254,7 @@ mod tests {
             )
         );
         assert_eq!(value!({"a": 10, "b": true}), {
-            let mut map = BTreeMap::new();
+            let mut map = IndexMap::new();
             map.insert(Name::new("a"), ConstValue::Number(10.into()));
             map.insert(Name::new("b"), ConstValue::Boolean(true));
             ConstValue::Object(map)
diff --git a/value/src/serializer.rs b/value/src/serializer.rs
index 1db14dfe..ac198822 100644
--- a/value/src/serializer.rs
+++ b/value/src/serializer.rs
@@ -1,7 +1,7 @@
-use std::collections::BTreeMap;
 use std::error::Error;
 use std::fmt;
 
+use indexmap::IndexMap;
 use serde::ser::{self, Impossible};
 use serde::Serialize;
 
@@ -180,7 +180,7 @@ impl ser::Serializer for Serializer {
         T: ser::Serialize,
     {
         value.serialize(self).map(|v| {
-            let mut map = BTreeMap::new();
+            let mut map = IndexMap::new();
             map.insert(Name::new(variant), v);
             ConstValue::Object(map)
         })
@@ -222,7 +222,7 @@ impl ser::Serializer for Serializer {
     #[inline]
     fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
         Ok(SerializeMap {
-            map: BTreeMap::new(),
+            map: IndexMap::new(),
             key: None,
         })
     }
@@ -233,7 +233,7 @@ impl ser::Serializer for Serializer {
         _name: &'static str,
         _len: usize,
     ) -> Result<Self::SerializeStruct, Self::Error> {
-        Ok(SerializeStruct(BTreeMap::new()))
+        Ok(SerializeStruct(IndexMap::new()))
     }
 
     #[inline]
@@ -244,7 +244,7 @@ impl ser::Serializer for Serializer {
         variant: &'static str,
         _len: usize,
     ) -> Result<Self::SerializeStructVariant, Self::Error> {
-        Ok(SerializeStructVariant(Name::new(variant), BTreeMap::new()))
+        Ok(SerializeStructVariant(Name::new(variant), IndexMap::new()))
     }
 
     #[inline]
@@ -337,14 +337,14 @@ impl ser::SerializeTupleVariant for SerializeTupleVariant {
 
     #[inline]
     fn end(self) -> Result<Self::Ok, Self::Error> {
-        let mut map = BTreeMap::new();
+        let mut map = IndexMap::new();
         map.insert(self.0, ConstValue::List(self.1));
         Ok(ConstValue::Object(map))
     }
 }
 
 struct SerializeMap {
-    map: BTreeMap<Name, ConstValue>,
+    map: IndexMap<Name, ConstValue>,
     key: Option<Name>,
 }
 
@@ -378,7 +378,7 @@ impl ser::SerializeMap for SerializeMap {
     }
 }
 
-struct SerializeStruct(BTreeMap<Name, ConstValue>);
+struct SerializeStruct(IndexMap<Name, ConstValue>);
 
 impl ser::SerializeStruct for SerializeStruct {
     type Ok = ConstValue;
@@ -405,7 +405,7 @@ impl ser::SerializeStruct for SerializeStruct {
     }
 }
 
-struct SerializeStructVariant(Name, BTreeMap<Name, ConstValue>);
+struct SerializeStructVariant(Name, IndexMap<Name, ConstValue>);
 
 impl ser::SerializeStructVariant for SerializeStructVariant {
     type Ok = ConstValue;
@@ -428,7 +428,7 @@ impl ser::SerializeStructVariant for SerializeStructVariant {
 
     #[inline]
     fn end(self) -> Result<Self::Ok, Self::Error> {
-        let mut map = BTreeMap::new();
+        let mut map = IndexMap::new();
         map.insert(self.0, ConstValue::Object(self.1));
         Ok(ConstValue::Object(map))
     }
diff --git a/value/src/value_serde.rs b/value/src/value_serde.rs
index 7e2ffb7a..3d6aa76a 100644
--- a/value/src/value_serde.rs
+++ b/value/src/value_serde.rs
@@ -1,6 +1,6 @@
-use std::collections::BTreeMap;
 use std::fmt::{self, Formatter};
 
+use indexmap::IndexMap;
 use serde::de::{Error as DeError, MapAccess, SeqAccess, Visitor};
 use serde::ser::Error as SerError;
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
@@ -137,7 +137,7 @@ impl<'de> Deserialize<'de> for ConstValue {
             where
                 A: MapAccess<'de>,
             {
-                let mut map = BTreeMap::new();
+                let mut map = IndexMap::new();
                 while let Some((name, value)) = visitor.next_entry()? {
                     map.insert(name, value);
                 }
@@ -280,7 +280,7 @@ impl<'de> Deserialize<'de> for Value {
             where
                 A: MapAccess<'de>,
             {
-                let mut map = BTreeMap::new();
+                let mut map = IndexMap::new();
                 while let Some((name, value)) = visitor.next_entry()? {
                     map.insert(name, value);
                 }
diff --git a/value/src/variables.rs b/value/src/variables.rs
index 7e9d7d1e..8599085c 100644
--- a/value/src/variables.rs
+++ b/value/src/variables.rs
@@ -36,7 +36,7 @@ impl Variables {
     #[must_use]
     pub fn from_value(value: ConstValue) -> Self {
         match value {
-            ConstValue::Object(obj) => Self(obj),
+            ConstValue::Object(obj) => Self(obj.into_iter().collect()),
             _ => Self::default(),
         }
     }
@@ -55,7 +55,7 @@ impl Variables {
     /// Get the variables as a GraphQL value.
     #[must_use]
     pub fn into_value(self) -> ConstValue {
-        ConstValue::Object(self.0)
+        ConstValue::Object(self.0.into_iter().collect())
     }
 }