diff --git a/modelscope_agent/agents/data_science_assistant.py b/modelscope_agent/agents/data_science_assistant.py
index db8ad247..3e8a2818 100644
--- a/modelscope_agent/agents/data_science_assistant.py
+++ b/modelscope_agent/agents/data_science_assistant.py
@@ -39,8 +39,7 @@
 - **other**: Any tasks not in the defined categories
 
 # Task:
-Based on the context, write a simple plan or modify an existing plan of what you should do to achieve the goal. A plan \
-consists of one to four tasks.
+Based on the context, write a simple plan or modify an existing plan of what you should do to achieve the goal.
 
 Output a list of jsons following the format:
 ```json
@@ -55,6 +54,43 @@
 ]
 ```
 """
+
+DECOMPOSE_TASK_TEMPLATE = """
+# Context:
+{context}
+# Available Task Types:
+- **eda**: For performing exploratory data analysis
+- **data preprocessing**: For preprocessing dataset in a data analysis or machine learning task ONLY,\
+general data operation doesn't fall into this type
+- **feature engineering**: Only for creating new columns fo input data.
+- **model train**: Only for training model.
+- **model evaluate**: Only for evaluating model.
+- **ocr**: Only for OCR tasks.
+- **other**: Any tasks not in the defined categories
+
+# Previous Tasks
+We have already generated the following tasks:
+{previous_tasks}
+# Task:
+The current task is:
+{current_task}
+Currently, the current task is too complex to be executed in one step. Please decompose the task into smaller tasks, \
+and output a list of jsons following the format:
+Output a list of jsons following the format:
+```json
+[
+    {{
+        "task_id": str = "unique identifier for a task in plan, can be an \
+        ordinal, should be unique and not conflict with previous task ids",
+        "dependent_task_ids": list[str] = "ids of tasks prerequisite to this task",
+        "instruction": "what you should do in this task, one short phrase or sentence",
+        "task_type": "type of this task, should be one of Available Task Types",
+    }},
+    ...
+]
+```
+"""
+
 CODE_TEMPLATE = """
 # Task
 you are a code generator, you need to generate a code python block in jupyter notebook to achieve the \
@@ -634,7 +670,7 @@ def _run(self, user_request, save: bool = True, **kwargs):
                 previous_code_blocks = self._get_previous_code_blocks()
                 success = False
                 code_counter = 0
-                max_try = kwargs.get('max_try', 10)
+                max_try = kwargs.get('max_try', 1)
                 while not success and code_counter < max_try:
                     code_execute_success = False
                     code_logic_success = False
@@ -726,9 +762,13 @@ def _run(self, user_request, save: bool = True, **kwargs):
                                 encoding='utf-8') as file:
                             nbformat.write(self.code_interpreter.nb, file)
                 else:
-                    self.plan = self._update_plan(
-                        user_request=user_request, curr_plan=self.plan)
-                    self.code_interpreter.reset()
+                    decomposed_tasks = self._decompose_task(task)
+                    if decomposed_tasks:
+                        self.plan.replace_task(task, decomposed_tasks)
+                    else:
+                        self.plan = self._update_plan(
+                            user_request=user_request, curr_plan=self.plan)
+                        self.code_interpreter.reset()
             # save the plan into json file
             if save:
                 after_time = time.time()
@@ -769,3 +809,30 @@ def _get_total_tokens(self):
         except Exception as e:
             logger.error(f'get total token error: {e}')
         pass
+
+    def _decompose_task(self, task):
+        try:
+            print(f'decompose task {task.task_id}')
+            messages = [{
+                'role':
+                'user',
+                'content':
+                DECOMPOSE_TASK_TEMPLATE.format(
+                    context='User Request: ' + task.instruction + '\n',
+                    previous_tasks='\n'.join(
+                        [json.dumps(t.__dict__) for t in self.plan.tasks]),
+                    current_task=json.dumps(task.__dict__))
+            }]
+            resp = self._call_llm(prompt=None, messages=messages, stop=None)
+            tasks_text = ''
+            for r in resp:
+                tasks_text += r
+            tasks_text = parse_code(text=tasks_text, lang='json')
+            logger.info(f'decomposed tasks: {tasks_text}')
+            print(f'decomposed tasks: {tasks_text}')
+            tasks = json5.loads(tasks_text)
+            tasks = [Task(**task) for task in tasks]
+            return tasks
+        except Exception as e:
+            logger.error(f'decompose task error: {e}')
+            return None