diff --git a/kclvm/sema/src/resolver/calculation.rs b/kclvm/sema/src/resolver/calculation.rs
index c056e8038..a3715eebb 100644
--- a/kclvm/sema/src/resolver/calculation.rs
+++ b/kclvm/sema/src/resolver/calculation.rs
@@ -2,8 +2,9 @@ use std::sync::Arc;
 
 use crate::resolver::Resolver;
 use crate::ty::{
-    has_any_type, is_upper_bound, sup, Type, TypeInferMethods, TypeRef, ZERO_LIT_TYPES,
+    has_any_type, is_upper_bound, sup, Type, TypeInferMethods, TypeKind, TypeRef, ZERO_LIT_TYPES,
 };
+use indexmap::IndexMap;
 use kclvm_ast::ast;
 use kclvm_error::diagnostic::Range;
 
@@ -162,12 +163,23 @@ impl<'ctx> Resolver<'ctx> {
                         true,
                         Type::list_ref(sup(&[t1.list_item_ty(), t2.list_item_ty()])),
                     )
-                } else if t1.is_dict() && t2.is_dict() {
-                    let (t1_key_ty, t1_val_ty) = t1.dict_entry_ty();
-                    let (t2_key_ty, t2_val_ty) = t2.dict_entry_ty();
+                } else if let (TypeKind::Dict(t1_dict_ty), TypeKind::Dict(t2_dict_ty)) =
+                    (&t1.kind, &t2.kind)
+                {
+                    let mut attrs = IndexMap::new();
+                    for (k, v) in &t1_dict_ty.attrs {
+                        attrs.insert(k.to_string(), v.clone());
+                    }
+                    for (k, v) in &t2_dict_ty.attrs {
+                        attrs.insert(k.to_string(), v.clone());
+                    }
                     (
                         true,
-                        Type::dict_ref(sup(&[t1_key_ty, t2_key_ty]), sup(&[t1_val_ty, t2_val_ty])),
+                        Arc::new(Type::dict_with_attrs(
+                            sup(&[t1_dict_ty.key_ty.clone(), t2_dict_ty.key_ty.clone()]),
+                            sup(&[t1_dict_ty.val_ty.clone(), t2_dict_ty.val_ty.clone()]),
+                            attrs,
+                        )),
                     )
                 } else if t1.is_schema() && (t2.is_schema() || t2.is_dict()) {
                     (true, t1)
diff --git a/kclvm/sema/src/resolver/ty.rs b/kclvm/sema/src/resolver/ty.rs
index f37e38182..7f58a1c13 100644
--- a/kclvm/sema/src/resolver/ty.rs
+++ b/kclvm/sema/src/resolver/ty.rs
@@ -297,21 +297,44 @@ impl<'ctx> Resolver<'ctx> {
                 }
                 _ => val_ty,
             };
-
-            if !self.check_type(val_ty.clone(), index_signature.val_ty.clone(), range) {
-                self.handler.add_type_error(
-                    &format!(
-                        "expected schema index signature value type {}, got {}",
-                        index_signature.val_ty.ty_str(),
-                        val_ty.ty_str()
-                    ),
-                    range.clone(),
-                );
-            }
-
-            if index_signature.any_other {
-                return self.check_type(key_ty, index_signature.key_ty.clone(), range)
-                    && self.check_type(val_ty, index_signature.val_ty.clone(), range);
+            if dict_ty.attrs.is_empty() {
+                if !self.check_type(val_ty.clone(), index_signature.val_ty.clone(), range) {
+                    self.handler.add_type_error(
+                        &format!(
+                            "expected schema index signature value type {}, got {}",
+                            index_signature.val_ty.ty_str(),
+                            val_ty.ty_str()
+                        ),
+                        range.clone(),
+                    );
+                }
+            } else {
+                for (name, attr) in &dict_ty.attrs {
+                    if index_signature.any_other {
+                        if let Some(attr_obj) = schema_ty.attrs.get(name) {
+                            self.must_assignable_to(
+                                attr.ty.clone(),
+                                attr_obj.ty.clone(),
+                                range.clone(),
+                                Some(attr_obj.range.clone()),
+                            );
+                        } else {
+                            self.must_assignable_to(
+                                attr.ty.clone(),
+                                index_signature.val_ty.clone(),
+                                attr.range.clone(),
+                                None,
+                            );
+                        }
+                    } else {
+                        self.must_assignable_to(
+                            attr.ty.clone(),
+                            index_signature.val_ty.clone(),
+                            attr.range.clone(),
+                            None,
+                        );
+                    }
+                }
             }
             true
         } else {
@@ -319,12 +342,14 @@ impl<'ctx> Resolver<'ctx> {
             // check whether the type of key value pair in dict matches the attribute type in the schema.
             if let TypeKind::StrLit(key_name) = &key_ty.kind {
                 if let Some(attr_obj) = schema_ty.attrs.get(key_name) {
-                    self.must_assignable_to(
-                        val_ty.clone(),
-                        attr_obj.ty.clone(),
-                        range.clone(),
-                        Some(attr_obj.range.clone()),
-                    );
+                    if let Some(attr) = dict_ty.attrs.get(key_name) {
+                        self.must_assignable_to(
+                            attr.ty.clone(),
+                            attr_obj.ty.clone(),
+                            range.clone(),
+                            Some(attr_obj.range.clone()),
+                        );
+                    }
                     return true;
                 }
             }
diff --git a/test/grammar/lambda/type_annotation/schema/invalid_1/stderr.golden b/test/grammar/lambda/type_annotation/schema/invalid_1/stderr.golden
index 800a02d77..f3b53e884 100644
--- a/test/grammar/lambda/type_annotation/schema/invalid_1/stderr.golden
+++ b/test/grammar/lambda/type_annotation/schema/invalid_1/stderr.golden
@@ -17,55 +17,3 @@ error[E2G22]: TypeError
 10 |         hello: "world"
    |         ^ expected int, got str(world)
    |
-
- --> ${CWD}/main.k:7:5
-  |
-7 |     {
-  |     ^ variable is defined here, its type is int, but got str(world)
-  |
-
-error[E2G22]: TypeError
-  --> ${CWD}/main.k:15:5
-   |
-15 |     version: 1
-   |     ^ expected str, got int(1)
-   |
-
- --> ${CWD}/main.k:3:5
-  |
-3 |     version: str
-  |     ^ variable is defined here, its type is str, but got int(1)
-  |
-
-error[E2G22]: TypeError
-  --> ${CWD}/main.k:16:5
-   |
-16 |     hello: "world"
-   |     ^ expected int, got str(world)
-   |
-
-  --> ${CWD}/main.k:14:20
-   |
-14 | v = providerFamily({
-   |                    ^ variable is defined here, its type is int, but got str(world)
-   |
-
-error[E2G22]: TypeError
-  --> ${CWD}/main.k:14:20
-   |
-14 | v = providerFamily({
-   |                    ^ expected schema index signature value type int, got str(world)
-   |
-
-error[E2G22]: TypeError
-  --> ${CWD}/main.k:14:20
-   |
-14 | v = providerFamily({
-   |                    ^ expected ProviderFamily, got {str(version) | str(hello):int(1) | str(world)}
-   |
-
- --> ${CWD}/main.k:6:25
-  |
-6 | providerFamily = lambda family: ProviderFamily -> ProviderFamily {
-  |                         ^ variable is defined here, its type is ProviderFamily, but got {str(version) | str(hello):int(1) | str(world)}
-  |
diff --git a/test/grammar/schema/type/config_expr_index_signature_fail/stderr.golden b/test/grammar/schema/type/config_expr_index_signature_fail/stderr.golden
index 2f845e457..5fa973e24 100644
--- a/test/grammar/schema/type/config_expr_index_signature_fail/stderr.golden
+++ b/test/grammar/schema/type/config_expr_index_signature_fail/stderr.golden
@@ -9,20 +9,3 @@ error[E2G22]: TypeError
 6 |     name: Name
   |     ^ variable is defined here, its type is int, but got str(aa)
   |
-error[E2G22]: TypeError
- --> ${CWD}/main.k:9:5
-  |
-9 |     name: {
-  |     ^ expected schema index signature value type int, got str(aa)
-  |
-error[E2G22]: TypeError
- --> ${CWD}/main.k:9:5
-  |
-9 |     name: {
-  |     ^ expected Name, got {str(classID):str(aa)}
-  |
- --> ${CWD}/main.k:6:5
-  |
-6 |     name: Name
-  |     ^ variable is defined here, its type is Name, but got {str(classID):str(aa)}
-  |
\ No newline at end of file
diff --git a/test/grammar/schema/type/config_expr_type_fail_1/stderr.golden b/test/grammar/schema/type/config_expr_type_fail_1/stderr.golden
index b31f9c66b..3315d2496 100644
--- a/test/grammar/schema/type/config_expr_type_fail_1/stderr.golden
+++ b/test/grammar/schema/type/config_expr_type_fail_1/stderr.golden
@@ -6,28 +6,6 @@ error[E2G22]: TypeError
    |
  --> ${CWD}/main.k:2:5
   |
-2 |     name: str = "Kiki"
-  |     ^ variable is defined here, its type is str, but got int(123)
-  |
-error[E2G22]: TypeError
-  --> ${CWD}/main.k:12:10
-   |
-12 |     name.name0.name = 123
-   |          ^ expected str, got int(123)
-   |
- --> ${CWD}/main.k:2:5
-  |
-2 |     name: str = "Kiki"
-  |     ^ variable is defined here, its type is str, but got int(123)
-  |
-error[E2G22]: TypeError
-  --> ${CWD}/main.k:12:5
-   |
-12 |     name.name0.name = 123
-   |     ^ expected str, got int(123)
-   |
- --> ${CWD}/main.k:2:5
-  |
 2 |     name: str = "Kiki"
   |     ^ variable is defined here, its type is str, but got int(123)
   |
\ No newline at end of file
diff --git a/test/grammar/schema/type/type_fail_24/stderr.golden b/test/grammar/schema/type/type_fail_24/stderr.golden
index fa614fe86..5e8afcec9 100644
--- a/test/grammar/schema/type/type_fail_24/stderr.golden
+++ b/test/grammar/schema/type/type_fail_24/stderr.golden
@@ -35,10 +35,10 @@ error[E2G22]: TypeError
  --> ${CWD}/main.k:4:5
   |
 4 |     name: {
-  |     ^ expected [Container], got {str(image) | str(name):str(image) | str(name)}
+  |     ^ expected [Container], got {str:str}
   |
  --> ${CWD}/pkg/person.k:3:5
   |
 3 |     spec: [Container]
-  |     ^ variable is defined here, its type is [Container], but got {str(image) | str(name):str(image) | str(name)}
+  |     ^ variable is defined here, its type is [Container], but got {str:str}
   |
\ No newline at end of file
diff --git a/test/grammar/types/union_expr/union_expr_0/main.k b/test/grammar/types/union_expr/union_expr_0/main.k
new file mode 100644
index 000000000..02b6375c7
--- /dev/null
+++ b/test/grammar/types/union_expr/union_expr_0/main.k
@@ -0,0 +1,14 @@
+schema Container:
+    name: str
+    image: str
+    volumeMounts: [{str:}]
+
+config = {
+    image = "test/test-container:test-cluster"
+    volumeMounts = [{
+        name = "config"
+        mountPath = "/app/config"
+    }]
+}
+
+expected: Container = config | {name = "test-repo/test-image:test-tag"}
diff --git a/test/grammar/types/union_expr/union_expr_0/stdout.golden b/test/grammar/types/union_expr/union_expr_0/stdout.golden
new file mode 100644
index 000000000..d06053bb0
--- /dev/null
+++ b/test/grammar/types/union_expr/union_expr_0/stdout.golden
@@ -0,0 +1,11 @@
+config:
+  image: test/test-container:test-cluster
+  volumeMounts:
+  - name: config
+    mountPath: /app/config
+expected:
+  name: test-repo/test-image:test-tag
+  image: test/test-container:test-cluster
+  volumeMounts:
+  - name: config
+    mountPath: /app/config
diff --git a/test/grammar/types/union_expr/union_expr_1/main.k b/test/grammar/types/union_expr/union_expr_1/main.k
new file mode 100644
index 000000000..e4d638054
--- /dev/null
+++ b/test/grammar/types/union_expr/union_expr_1/main.k
@@ -0,0 +1,16 @@
+schema Container:
+    name: str
+    image: str
+    volumeMounts: [{str:}]
+
+schema Config:
+    _config = {
+        image = "test/test-container:test-cluster"
+        volumeMounts = [{
+            name = "config"
+            mountPath = "/app/config"
+        }]
+    }
+    expected: Container = _config | {name = "test-repo/test-image:test-tag"}
+
+config = Config {}
diff --git a/test/grammar/types/union_expr/union_expr_1/stdout.golden b/test/grammar/types/union_expr/union_expr_1/stdout.golden
new file mode 100644
index 000000000..6918159dd
--- /dev/null
+++ b/test/grammar/types/union_expr/union_expr_1/stdout.golden
@@ -0,0 +1,7 @@
+config:
+  expected:
+    name: test-repo/test-image:test-tag
+    image: test/test-container:test-cluster
+    volumeMounts:
+    - name: config
+      mountPath: /app/config
diff --git a/test/grammar/types/union_expr/union_expr_fail_0/main.k b/test/grammar/types/union_expr/union_expr_fail_0/main.k
new file mode 100644
index 000000000..5366ff5ea
--- /dev/null
+++ b/test/grammar/types/union_expr/union_expr_fail_0/main.k
@@ -0,0 +1,14 @@
+schema Container:
+    name: str
+    image: str
+    volumeMounts: [{str:}]
+
+config = {
+    image = "test/test-container:test-cluster"
+    volumeMounts = [{
+        name = "config"
+        mountPath = "/app/config"
+    }]
+}
+
+expected: Container = config | {name = 1}
diff --git a/test/grammar/types/union_expr/union_expr_fail_0/stderr.golden b/test/grammar/types/union_expr/union_expr_fail_0/stderr.golden
new file mode 100644
index 000000000..343df5335
--- /dev/null
+++ b/test/grammar/types/union_expr/union_expr_fail_0/stderr.golden
@@ -0,0 +1,6 @@
+error[E2G22]: TypeError
+  --> ${CWD}/main.k:14:33
+   |
+14 | expected: Container = config | {name = 1}
+   |                                 ^ expected str, got int(1)
+   |
diff --git a/test/grammar/types/union_expr/union_expr_fail_1/main.k b/test/grammar/types/union_expr/union_expr_fail_1/main.k
new file mode 100644
index 000000000..a99710fe2
--- /dev/null
+++ b/test/grammar/types/union_expr/union_expr_fail_1/main.k
@@ -0,0 +1,16 @@
+schema Container:
+    name: str
+    image: str
+    volumeMounts: [{str:}]
+
+schema Config:
+    _config = {
+        image = "test/test-container:test-cluster"
+        volumeMounts = [{
+            name = "config"
+            mountPath = "/app/config"
+        }]
+    }
+    expected: Container = _config | {name = 1}
+
+config = Config {}
diff --git a/test/grammar/types/union_expr/union_expr_fail_1/stderr.golden b/test/grammar/types/union_expr/union_expr_fail_1/stderr.golden
new file mode 100644
index 000000000..b945f754e
--- /dev/null
+++ b/test/grammar/types/union_expr/union_expr_fail_1/stderr.golden
@@ -0,0 +1,6 @@
+error[E2G22]: TypeError
+  --> ${CWD}/main.k:14:38
+   |
+14 |     expected: Container = _config | {name = 1}
+   |                                      ^ expected str, got int(1)
+   |
diff --git a/test/grammar/types/union_expr/union_expr_fail_2/main.k b/test/grammar/types/union_expr/union_expr_fail_2/main.k
new file mode 100644
index 000000000..ee5d194d4
--- /dev/null
+++ b/test/grammar/types/union_expr/union_expr_fail_2/main.k
@@ -0,0 +1,17 @@
+schema Container:
+    name: str
+    image: str
+    volumeMounts: [{str:}]
+
+schema Config:
+    _config = {
+        name = 1
+        image = "test/test-container:test-cluster"
+        volumeMounts = [{
+            name = "config"
+            mountPath = "/app/config"
+        }]
+    }
+    expected: Container = _config | {}
+
+config = Config {}
diff --git a/test/grammar/types/union_expr/union_expr_fail_2/stderr.golden b/test/grammar/types/union_expr/union_expr_fail_2/stderr.golden
new file mode 100644
index 000000000..5ef591674
--- /dev/null
+++ b/test/grammar/types/union_expr/union_expr_fail_2/stderr.golden
@@ -0,0 +1,6 @@
+error[E3M38]: EvaluationError
+ --> ${CWD}/main.k:2:1
+  |
+2 |     name: str
+  |  expect str, got int
+  |