diff --git a/api/core/app/apps/advanced_chat/app_generator.py b/api/core/app/apps/advanced_chat/app_generator.py
index 458bb5d2f6..6d0ceac253 100644
--- a/api/core/app/apps/advanced_chat/app_generator.py
+++ b/api/core/app/apps/advanced_chat/app_generator.py
@@ -23,8 +23,6 @@ from core.app.entities.task_entities import ChatbotAppBlockingResponse, ChatbotA
 from core.file.message_file_parser import MessageFileParser
 from core.model_runtime.errors.invoke import InvokeAuthorizationError, InvokeError
 from core.ops.ops_trace_manager import TraceQueueManager
-from core.workflow.entities.variable_pool import VariablePool
-from core.workflow.enums import SystemVariableKey
 from extensions.ext_database import db
 from models.account import Account
 from models.model import App, Conversation, EndUser, Message
diff --git a/api/core/workflow/nodes/variable_assigner/node.py b/api/core/workflow/nodes/variable_assigner/node.py
index 79b7bb1c26..b2f32c6aaa 100644
--- a/api/core/workflow/nodes/variable_assigner/node.py
+++ b/api/core/workflow/nodes/variable_assigner/node.py
@@ -6,7 +6,6 @@ from sqlalchemy.orm import Session
 from core.app.segments import SegmentType, Variable, factory
 from core.workflow.entities.base_node_data_entities import BaseNodeData
 from core.workflow.entities.node_entities import NodeRunResult, NodeType
-from core.workflow.entities.variable_pool import VariablePool
 from core.workflow.nodes.base_node import BaseNode
 from extensions.ext_database import db
 from models import ConversationVariable, WorkflowNodeExecutionStatus