diff --git a/api/core/app/apps/workflow/app_generator.py b/api/core/app/apps/workflow/app_generator.py
index f4aec3479b..022beef00c 100644
--- a/api/core/app/apps/workflow/app_generator.py
+++ b/api/core/app/apps/workflow/app_generator.py
@@ -48,6 +48,7 @@ class WorkflowAppGenerator(BaseAppGenerator):
         streaming: Literal[True],
         call_depth: int,
         workflow_thread_pool_id: Optional[str],
+        conversation_id: Optional[str],
     ) -> Generator[Mapping | str, None, None]: ...
 
     @overload
@@ -62,6 +63,7 @@ class WorkflowAppGenerator(BaseAppGenerator):
         streaming: Literal[False],
         call_depth: int,
         workflow_thread_pool_id: Optional[str],
+        conversation_id: Optional[str],
     ) -> Mapping[str, Any]: ...
 
     @overload
@@ -76,6 +78,7 @@ class WorkflowAppGenerator(BaseAppGenerator):
         streaming: bool,
         call_depth: int,
         workflow_thread_pool_id: Optional[str],
+        conversation_id: Optional[str],
     ) -> Union[Mapping[str, Any], Generator[Mapping | str, None, None]]: ...
 
     def generate(
@@ -89,6 +92,7 @@ class WorkflowAppGenerator(BaseAppGenerator):
         streaming: bool = True,
         call_depth: int = 0,
         workflow_thread_pool_id: Optional[str] = None,
+        conversation_id: Optional[str] = None,
     ) -> Union[Mapping[str, Any], Generator[Mapping | str, None, None]]:
         files: Sequence[Mapping[str, Any]] = args.get("files") or []
 
@@ -133,6 +137,7 @@ class WorkflowAppGenerator(BaseAppGenerator):
             call_depth=call_depth,
             trace_manager=trace_manager,
             workflow_execution_id=workflow_run_id,
+            conversation_id=conversation_id,
         )
 
         contexts.plugin_tool_providers.set({})
@@ -280,6 +285,7 @@ class WorkflowAppGenerator(BaseAppGenerator):
                 node_id=node_id, inputs=args["inputs"]
             ),
             workflow_execution_id=str(uuid.uuid4()),
+            conversation_id=None,
         )
         contexts.plugin_tool_providers.set({})
         contexts.plugin_tool_providers_lock.set(threading.Lock())
@@ -356,6 +362,7 @@ class WorkflowAppGenerator(BaseAppGenerator):
             extras={"auto_generate_conversation_name": False},
             single_loop_run=WorkflowAppGenerateEntity.SingleLoopRunEntity(node_id=node_id, inputs=args["inputs"]),
             workflow_execution_id=str(uuid.uuid4()),
+            conversation_id=None,
         )
         contexts.plugin_tool_providers.set({})
         contexts.plugin_tool_providers_lock.set(threading.Lock())
diff --git a/api/core/app/apps/workflow/app_runner.py b/api/core/app/apps/workflow/app_runner.py
index b59e34e222..f3676305a8 100644
--- a/api/core/app/apps/workflow/app_runner.py
+++ b/api/core/app/apps/workflow/app_runner.py
@@ -96,6 +96,7 @@ class WorkflowAppRunner(WorkflowBasedAppRunner):
                 SystemVariableKey.APP_ID: app_config.app_id,
                 SystemVariableKey.WORKFLOW_ID: app_config.workflow_id,
                 SystemVariableKey.WORKFLOW_EXECUTION_ID: self.application_generate_entity.workflow_execution_id,
+                SystemVariableKey.CONVERSATION_ID: self.application_generate_entity.conversation_id,
             }
 
             variable_pool = VariablePool(
diff --git a/api/core/app/entities/app_invoke_entities.py b/api/core/app/entities/app_invoke_entities.py
index c0d99693b0..f16b55a91b 100644
--- a/api/core/app/entities/app_invoke_entities.py
+++ b/api/core/app/entities/app_invoke_entities.py
@@ -205,6 +205,7 @@ class WorkflowAppGenerateEntity(AppGenerateEntity):
     # app config
     app_config: WorkflowUIBasedAppConfig
     workflow_execution_id: str
+    conversation_id: Optional[str]
 
     class SingleIterationRunEntity(BaseModel):
         """
diff --git a/api/core/plugin/backwards_invocation/app.py b/api/core/plugin/backwards_invocation/app.py
index 4e43561a15..5eca5197b8 100644
--- a/api/core/plugin/backwards_invocation/app.py
+++ b/api/core/plugin/backwards_invocation/app.py
@@ -165,6 +165,7 @@ class PluginAppBackwardsInvocation(BaseBackwardsInvocation):
             streaming=stream,
             call_depth=1,
             workflow_thread_pool_id=None,
+            conversation_id=None,
         )
 
     @classmethod
diff --git a/api/core/tools/workflow_as_tool/tool.py b/api/core/tools/workflow_as_tool/tool.py
index 57c93d1d45..57b9af146f 100644
--- a/api/core/tools/workflow_as_tool/tool.py
+++ b/api/core/tools/workflow_as_tool/tool.py
@@ -95,6 +95,7 @@ class WorkflowTool(Tool):
             streaming=False,
             call_depth=self.workflow_call_depth + 1,
             workflow_thread_pool_id=self.thread_pool_id,
+            conversation_id=conversation_id,
         )
         assert isinstance(result, dict)
         data = result.get("data", {})
diff --git a/api/services/app_generate_service.py b/api/services/app_generate_service.py
index 245c123a04..aa3bbaf15c 100644
--- a/api/services/app_generate_service.py
+++ b/api/services/app_generate_service.py
@@ -113,6 +113,7 @@ class AppGenerateService:
                             streaming=streaming,
                             call_depth=0,
                             workflow_thread_pool_id=None,
+                            conversation_id=None,
                         ),
                     ),
                     request_id,
diff --git a/web/app/components/workflow/nodes/_base/components/variable/utils.ts b/web/app/components/workflow/nodes/_base/components/variable/utils.ts
index 428c204dd3..3f6122e830 100644
--- a/web/app/components/workflow/nodes/_base/components/variable/utils.ts
+++ b/web/app/components/workflow/nodes/_base/components/variable/utils.ts
@@ -200,11 +200,11 @@ const formatItem = (
           variable: 'sys.dialogue_count',
           type: VarType.number,
         })
-        res.vars.push({
-          variable: 'sys.conversation_id',
-          type: VarType.string,
-        })
       }
+      res.vars.push({
+        variable: 'sys.conversation_id',
+        type: VarType.string,
+      })
       res.vars.push({
         variable: 'sys.user_id',
         type: VarType.string,