diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb8a3d4..f543719 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.11] - 2026-08-28
+
+### Added
+
+- Add `batchCreateItems` (`POST .../items/batch-create`), `batchUpdateItems` (`PUT .../items/batch-update`), and `batchDeleteItems` (`POST .../items/batch-delete`) APIs for submitting a list of namespace items to create, update, or delete in one call.
+
 ## [0.3.9] - 2026-06-10
 
 ### Added
diff --git a/apollo-openapi.yaml b/apollo-openapi.yaml
index bed0f6c..45f420b 100644
--- a/apollo-openapi.yaml
+++ b/apollo-openapi.yaml
@@ -18,7 +18,7 @@ info:
     <pre><code class="language-bash">curl -X GET "http://localhost:8070/openapi/v1/apps" \
     -H "Authorization: your_token_here"</code></pre>
 
-  version: 0.3.9
+  version: 0.3.11
 security:
   - ApiKeyAuth: []
 tags:
@@ -945,6 +945,215 @@ paths:
               schema:
                 $ref: '#/components/schemas/ExceptionResponse'
           headers: {}
+  /openapi/v1/envs/{env}/apps/{appId}/clusters/{clusterName}/namespaces/{namespaceName}/items/batch-create:
+    post:
+      summary: 批量创建配置项 (new added)
+      operationId: batchCreateItems
+      deprecated: false
+      description: >-
+        POST
+        /openapi/v1/envs/{env}/apps/{appId}/clusters/{clusterName}/namespaces/{namespaceName}/items/batch-create
+      tags:
+        - Item Management
+      parameters:
+        - name: appId
+          in: path
+          description: '应用ID'
+          required: true
+          schema:
+            type: string
+        - name: env
+          in: path
+          description: '环境标识'
+          required: true
+          schema:
+            type: string
+        - name: clusterName
+          in: path
+          description: '集群名称'
+          required: true
+          schema:
+            type: string
+        - name: namespaceName
+          in: path
+          description: '命名空间名称'
+          required: true
+          schema:
+            type: string
+        - name: operator
+          in: query
+          description: '操作人用户名'
+          required: false
+          schema:
+            type: string
+      requestBody:
+        content:
+          application/json:
+            schema:
+              type: array
+              minItems: 1
+              items:
+                $ref: '#/components/schemas/OpenItemDTO'
+        required: true
+      responses:
+        '200':
+          description: '批量创建配置项成功'
+        '400':
+          description: '请求参数错误'
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ExceptionResponse'
+        '403':
+          description: '权限不足'
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ExceptionResponse'
+  /openapi/v1/envs/{env}/apps/{appId}/clusters/{clusterName}/namespaces/{namespaceName}/items/batch-update:
+    put:
+      summary: 批量修改配置项 (new added)
+      operationId: batchUpdateItems
+      deprecated: false
+      description: >-
+        PUT
+        /openapi/v1/envs/{env}/apps/{appId}/clusters/{clusterName}/namespaces/{namespaceName}/items/batch-update
+      tags:
+        - Item Management
+      parameters:
+        - name: appId
+          in: path
+          description: '应用ID'
+          required: true
+          schema:
+            type: string
+        - name: env
+          in: path
+          description: '环境标识'
+          required: true
+          schema:
+            type: string
+        - name: clusterName
+          in: path
+          description: '集群名称'
+          required: true
+          schema:
+            type: string
+        - name: namespaceName
+          in: path
+          description: '命名空间名称'
+          required: true
+          schema:
+            type: string
+        - name: operator
+          in: query
+          description: '操作人用户名'
+          required: false
+          schema:
+            type: string
+      requestBody:
+        content:
+          application/json:
+            schema:
+              type: array
+              minItems: 1
+              items:
+                $ref: '#/components/schemas/OpenItemDTO'
+        required: true
+      responses:
+        '200':
+          description: '批量修改配置项成功'
+        '400':
+          description: '请求参数错误'
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ExceptionResponse'
+        '403':
+          description: '权限不足'
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ExceptionResponse'
+        '404':
+          description: '配置项不存在'
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ExceptionResponse'
+  /openapi/v1/envs/{env}/apps/{appId}/clusters/{clusterName}/namespaces/{namespaceName}/items/batch-delete:
+    post:
+      summary: 批量删除配置项 (new added)
+      operationId: batchDeleteItems
+      deprecated: false
+      description: >-
+        POST
+        /openapi/v1/envs/{env}/apps/{appId}/clusters/{clusterName}/namespaces/{namespaceName}/items/batch-delete
+      tags:
+        - Item Management
+      parameters:
+        - name: appId
+          in: path
+          description: '应用ID'
+          required: true
+          schema:
+            type: string
+        - name: env
+          in: path
+          description: '环境标识'
+          required: true
+          schema:
+            type: string
+        - name: clusterName
+          in: path
+          description: '集群名称'
+          required: true
+          schema:
+            type: string
+        - name: namespaceName
+          in: path
+          description: '命名空间名称'
+          required: true
+          schema:
+            type: string
+        - name: operator
+          in: query
+          description: '操作人用户名'
+          required: false
+          schema:
+            type: string
+      requestBody:
+        content:
+          application/json:
+            schema:
+              type: array
+              minItems: 1
+              items:
+                type: string
+                minLength: 1
+              description: 待删除的配置项 key 列表
+        required: true
+      responses:
+        '200':
+          description: '批量删除配置项成功'
+        '400':
+          description: '请求参数错误'
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ExceptionResponse'
+        '403':
+          description: '权限不足'
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ExceptionResponse'
+        '404':
+          description: '配置项不存在'
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ExceptionResponse'
   /openapi/v1/envs/{env}/apps/{appId}/clusters/{clusterName}/namespaces/{namespaceName}/encodedItems/{key}:
     get:
       summary: 通过查询参数获取配置项（支持编码的key） (original openapi)
diff --git a/tests/test_item_batch_contract.py b/tests/test_item_batch_contract.py
new file mode 100644
index 0000000..7ffa42c
--- /dev/null
+++ b/tests/test_item_batch_contract.py
@@ -0,0 +1,104 @@
+import unittest
+from pathlib import Path
+
+import yaml
+
+
+SPEC_FILES = (
+    "apollo-openapi.yaml",
+)
+
+BASE_PATH = (
+    "/openapi/v1/envs/{env}/apps/{appId}/clusters/{clusterName}"
+    "/namespaces/{namespaceName}/items"
+)
+
+
+class ItemBatchContractTest(unittest.TestCase):
+
+  def setUp(self):
+    self.repo_root = Path(__file__).resolve().parents[1]
+
+  def _load_spec(self, spec_file):
+    return yaml.safe_load((self.repo_root / spec_file).read_text(encoding="utf-8"))
+
+  def test_item_batch_paths_use_generated_contract(self):
+    for spec_file in SPEC_FILES:
+      spec = self._load_spec(spec_file)
+
+      with self.subTest(spec=spec_file):
+        tag_names = {tag["name"] for tag in spec["tags"]}
+        self.assertIn("Item Management", tag_names)
+
+        expected_operations = {
+            f"{BASE_PATH}/batch-create": ("post", "batchCreateItems"),
+            f"{BASE_PATH}/batch-update": ("put", "batchUpdateItems"),
+            f"{BASE_PATH}/batch-delete": ("post", "batchDeleteItems"),
+        }
+        for path, (method, operation_id) in expected_operations.items():
+          operation = spec["paths"][path][method]
+          self.assertEqual(operation_id, operation["operationId"])
+          self.assertEqual(["Item Management"], operation["tags"])
+          self.assertEqual(
+              "#/components/schemas/ExceptionResponse",
+              operation["responses"]["403"]["content"]["application/json"]["schema"]["$ref"],
+          )
+
+          parameter_names = {parameter["name"] for parameter in operation["parameters"]}
+          self.assertEqual(
+              {"appId", "env", "clusterName", "namespaceName", "operator"},
+              parameter_names,
+          )
+          operator_parameter = next(
+              parameter for parameter in operation["parameters"]
+              if parameter["name"] == "operator")
+          self.assertFalse(operator_parameter["required"])
+
+  def test_batch_create_and_update_accept_item_list(self):
+    for spec_file in SPEC_FILES:
+      spec = self._load_spec(spec_file)
+
+      with self.subTest(spec=spec_file):
+        for path, method in (
+            (f"{BASE_PATH}/batch-create", "post"),
+            (f"{BASE_PATH}/batch-update", "put"),
+        ):
+          operation = spec["paths"][path][method]
+          request_schema = operation["requestBody"]["content"]["application/json"]["schema"]
+          self.assertEqual("array", request_schema["type"])
+          self.assertEqual(1, request_schema["minItems"])
+          self.assertEqual(
+              "#/components/schemas/OpenItemDTO",
+              request_schema["items"]["$ref"],
+          )
+
+        update_operation = spec["paths"][f"{BASE_PATH}/batch-update"]["put"]
+        self.assertEqual(
+            "#/components/schemas/ExceptionResponse",
+            update_operation["responses"]["404"]["content"]["application/json"]["schema"][
+                "$ref"],
+        )
+
+  def test_batch_delete_accepts_key_list(self):
+    for spec_file in SPEC_FILES:
+      spec = self._load_spec(spec_file)
+
+      with self.subTest(spec=spec_file):
+        operation = spec["paths"][f"{BASE_PATH}/batch-delete"]["post"]
+        request_schema = operation["requestBody"]["content"]["application/json"]["schema"]
+        self.assertEqual("array", request_schema["type"])
+        self.assertEqual(1, request_schema["minItems"])
+        self.assertEqual("string", request_schema["items"]["type"])
+        self.assertEqual(1, request_schema["items"]["minLength"])
+        self.assertEqual(
+            "#/components/schemas/ExceptionResponse",
+            operation["responses"]["400"]["content"]["application/json"]["schema"]["$ref"],
+        )
+        self.assertEqual(
+            "#/components/schemas/ExceptionResponse",
+            operation["responses"]["404"]["content"]["application/json"]["schema"]["$ref"],
+        )
+
+
+if __name__ == "__main__":
+  unittest.main()