diff --git a/en-us/user-guide/knowledge-base/knowledge-and-documents-maintenance/maintain-dataset-via-api.mdx b/en-us/user-guide/knowledge-base/knowledge-and-documents-maintenance/maintain-dataset-via-api.mdx
index ea0471bf..b9174f36 100644
--- a/en-us/user-guide/knowledge-base/knowledge-and-documents-maintenance/maintain-dataset-via-api.mdx
+++ b/en-us/user-guide/knowledge-base/knowledge-and-documents-maintenance/maintain-dataset-via-api.mdx
@@ -684,3 +684,148 @@ Response example:
 | document\_already\_finished   | 400    | The document has been processed. Please refresh the page or go to the document details.      |
 | document\_indexing            | 400    | The document is being processed and cannot be edited.                                        |
 | invalid\_metadata             | 400    | The metadata content is incorrect. Please check and verify.                                  |
+
+#### Add Metadata Fields to the Knowledge Base
+
+Request example:
+
+```bash
+curl --location 'https://api.dify.ai/v1/datasets/{dataset_id}/metadata' \
+--header 'Content-Type: application/json' \
+--header 'Authorization: Bearer {api_key}' \
+--data '{
+    "type":"string",
+    "name":"test"
+}'
+```
+
+Response example:
+
+```json
+{
+    "id": "9f63c91b-d60e-4142-bb0c-c81a54dc2db5",
+    "type": "string",
+    "name": "test"
+}
+```
+
+#### Modify Metadata Fields in the Knowledge Base
+
+Request example:
+
+```bash
+curl --location --request PATCH 'https://api.dify.ai/v1/datasets/{dataset_id}/metadata/{metadata_id}' \
+--header 'Content-Type: application/json' \
+--header 'Authorization: Bearer {api_key}' \
+--data '{
+    "name":"test"
+}'
+```
+
+Response example:
+
+```json
+{
+    "id": "9f63c91b-d60e-4142-bb0c-c81a54dc2db5",
+    "type": "string",
+    "name": "test"
+}
+```
+
+#### Delete Metadata Fields in the Knowledge Base
+
+Request example:
+
+```bash
+curl --location --request DELETE 'https://api.dify.ai/v1/datasets/{dataset_id}/document/metadata/{metadata_id}' \
+--header 'Authorization: Bearer {api_key}'
+```
+
+Response example:
+
+```json
+200 success
+```
+
+#### Enable/Disable Built-in Fields in the Knowledge Base
+
+Request example:
+
+```bash
+curl --location --request DELETE 'https://api.dify.ai/v1/datasets/{dataset_id}/document/metadata/built-in/{action}' \
+--header 'Authorization: Bearer {api_key}'
+```
+
+Response example:
+
+```json
+200 success
+```
+
+#### Modify Metadata for a Single Document (Assignment)
+
+Request example:
+
+```bash
+curl --location 'https://api.dify.ai/v1/datasets/{dataset_id}/documents/metadata' \
+--header 'Content-Type: application/json' \
+--header 'Authorization: Bearer {api_key}'
+--data '{
+    "operation_data":[
+        {
+            "document_id": "3e928bc4-65ea-4201-87c8-cbcc5871f525",
+            "metadata_list": [
+                    {
+                    "id": "1887f5ec-966f-4c93-8c99-5ad386022f46",
+                    "value": "dify",
+                    "name": "test"
+                }
+            ]
+        }
+    ]
+}'
+```
+
+Response example:
+
+```json
+200 success
+```
+
+#### Metadata List of the Dataset
+
+Request example:
+
+```bash
+curl --location 'https://api.dify.ai/v1/datasets/{dataset_id}/metadata' \
+--header 'Authorization: Bearer {api_key}'
+```
+
+Response example:
+
+```json
+{
+  "doc_metadata": [
+    {
+      "id": "550e8400-e29b-41d4-a716-446655440000",
+      "type": "string",
+      "name": "title",
+      "use_count": 42
+    },
+    {
+      "id": "6ba7b810-9dad-11d1-80b4-00c04fd430c8",
+      "type": "number",
+      "name": "price",
+      "use_count": 28
+    },
+    {
+      "id": "7ba7b810-9dad-11d1-80b4-00c04fd430c9",
+      "type": "time",
+      "name": "created_at",
+      "use_count": 35
+    }
+  ],
+  "built_in_field_enabled": true
+}
+```
+