diff --git a/docs/docs/tools/builtin.md b/docs/docs/tools/builtin.md
index b262e875..5d232513 100644
--- a/docs/docs/tools/builtin.md
+++ b/docs/docs/tools/builtin.md
@@ -146,6 +146,7 @@ veADK 集成了以下火山引擎工具：
     - `AGENTKIT_TOOL_ID`：用于调用火山引擎AgentKit Tools的沙箱环境Id
     - `AGENTKIT_TOOL_HOST`：用于调用火山引擎AgentKit Tools的EndPoint
     - `AGENTKIT_TOOL_SERVICE_CODE`：用于调用AgentKit Tools的ServiceCode
+    - `AGENTKIT_TOOL_SCHEME`：用于切换调用 AgentKit Tools 的协议，允许 `http`/`https`，默认 `https`
 
     环境变量列表：
 
diff --git a/veadk/tools/builtin_tools/run_code.py b/veadk/tools/builtin_tools/run_code.py
index 4e05fe2d..8a1c0fe5 100644
--- a/veadk/tools/builtin_tools/run_code.py
+++ b/veadk/tools/builtin_tools/run_code.py
@@ -49,6 +49,9 @@ def run_code(
     host = getenv(
         "AGENTKIT_TOOL_HOST", service + "." + region + ".volces.com"
     )  # temporary host for code run tool
+    scheme = getenv("AGENTKIT_TOOL_SCHEME", "https", allow_false_values=True).lower()
+    if scheme not in {"http", "https"}:
+        scheme = "https"
     logger.debug(f"tools endpoint: {host}")
 
     session_id = tool_context._invocation_context.session.id
@@ -103,6 +106,7 @@ def run_code(
         region=region,
         host=host,
         header=header,
+        scheme=scheme,
     )
     logger.debug(f"Invoke run code response: {res}")
 
diff --git a/veadk/utils/volcengine_sign.py b/veadk/utils/volcengine_sign.py
index b47b6571..db8f5c68 100644
--- a/veadk/utils/volcengine_sign.py
+++ b/veadk/utils/volcengine_sign.py
@@ -25,6 +25,7 @@
 Region = ""
 Host = ""
 ContentType = ""
+Scheme = "https"
 
 
 def norm_query(params):
@@ -59,7 +60,17 @@ def hash_sha256(content: str):
 
 
 # 第二步：签名请求函数
-def request(method, date, query, header, ak, sk, action, body):
+def request(
+    method,
+    date,
+    query,
+    header,
+    ak,
+    sk,
+    action,
+    body,
+    scheme: Literal["http", "https"] = "https",
+):
     # 第三步：创建身份证明。其中的 Service 和 Region 字段是固定的。ak 和 sk 分别代表
     # AccessKeyID 和 SecretAccessKey。同时需要初始化签名结构体。一些签名计算时需要的属性也在这里处理。
     # 初始化身份证明结构体
@@ -151,7 +162,7 @@ def request(method, date, query, header, ak, sk, action, body):
     # 第六步：将 Signature 签名写入 HTTP Header 中，并发送 HTTP 请求。
     r = requests.request(
         method=method,
-        url="https://{}{}".format(request_param["host"], request_param["path"]),
+        url=f"{scheme}://{request_param['host']}{request_param['path']}",
         headers=header,
         params=request_param["query"],
         data=request_param["body"],
@@ -175,6 +186,7 @@ def ve_request(
     header: dict = {},
     query: dict = {},
     method: Literal["GET", "POST", "PUT", "DELETE"] = "POST",
+    scheme: Literal["http", "https"] = "https",
 ):
     global Service
     Service = service
@@ -186,6 +198,8 @@ def ve_request(
     Host = host
     global ContentType
     ContentType = content_type
+    global Scheme
+    Scheme = scheme
     AK = ak
     SK = sk
     now = datetime.datetime.utcnow()
@@ -195,7 +209,15 @@ def ve_request(
 
     try:
         response_body = request(
-            method, now, query, header, AK, SK, action, json.dumps(request_body)
+            method,
+            now,
+            query,
+            header,
+            AK,
+            SK,
+            action,
+            json.dumps(request_body),
+            Scheme,
         )
         return response_body
     except Exception as e: