diff --git a/sandbox-core/src/main/java/io/agentscope/runtime/sandbox/manager/SandboxService.java b/sandbox-core/src/main/java/io/agentscope/runtime/sandbox/manager/SandboxService.java
index eb8d6ca..efcaf3d 100644
--- a/sandbox-core/src/main/java/io/agentscope/runtime/sandbox/manager/SandboxService.java
+++ b/sandbox-core/src/main/java/io/agentscope/runtime/sandbox/manager/SandboxService.java
@@ -159,7 +159,7 @@ public ContainerModel createContainer(Sandbox sandbox) throws JsonProcessingExce
             logger.info("Docker image is ready: {}", imageName);
         }
 
-        String sessionId = RandomStringGenerator.generateRandomString(22);
+        String sessionId = sandbox.getSessionId();
         String currentDir = System.getProperty("user.dir");
         String mountDir = currentDir + "/" + default_mount_dir + "/" + sessionId;