diff --git a/config/config.yaml b/config/config.yaml
index 444f55efd..17339eda5 100644
--- a/config/config.yaml
+++ b/config/config.yaml
@@ -84,4 +84,4 @@ MODEL_FOR_RESEARCHER_REPORT: gpt-3.5-turbo-16k
 ### browser path for pyppeteer engine, support Chrome, Chromium,MS Edge
 #PYPPETEER_EXECUTABLE_PATH: "/usr/bin/google-chrome-stable"
 
-PROMPT_FORMAT: json #json or markdown
\ No newline at end of file
+PROMPT_FORMAT: markdown #json or markdown
\ No newline at end of file
diff --git a/metagpt/actions/design_api.py b/metagpt/actions/design_api.py
index af0ace497..f19fcbeaa 100644
--- a/metagpt/actions/design_api.py
+++ b/metagpt/actions/design_api.py
@@ -10,6 +10,7 @@ from pathlib import Path
 from typing import List
 
 from metagpt.actions import Action, ActionOutput
+from metagpt.config import CONFIG
 from metagpt.const import WORKSPACE_ROOT
 from metagpt.logs import logger
 from metagpt.utils.common import CodeParser
@@ -201,10 +202,10 @@ class WriteDesign(Action):
         await self._save_prd(docs_path, resources_path, context)
         await self._save_system_design(docs_path, resources_path, system_design)
 
-    async def run(self, context):
-        prompt_template, format_example = get_template(templates)
+    async def run(self, context, format=CONFIG.prompt_format):
+        prompt_template, format_example = get_template(templates, format)
         prompt = prompt_template.format(context=context, format_example=format_example)
         # system_design = await self._aask(prompt)
-        system_design = await self._aask_v1(prompt, "system_design", OUTPUT_MAPPING)
+        system_design = await self._aask_v1(prompt, "system_design", OUTPUT_MAPPING, format=format)
         await self._save(context, system_design)
         return system_design
diff --git a/metagpt/actions/project_management.py b/metagpt/actions/project_management.py
index bcaf85941..b395fa64e 100644
--- a/metagpt/actions/project_management.py
+++ b/metagpt/actions/project_management.py
@@ -8,6 +8,7 @@
 from typing import List
 
 from metagpt.actions.action import Action
+from metagpt.config import CONFIG
 from metagpt.const import WORKSPACE_ROOT
 from metagpt.utils.common import CodeParser
 from metagpt.utils.get_template import get_template
@@ -177,10 +178,10 @@ class WriteTasks(Action):
         requirements_path = WORKSPACE_ROOT / ws_name / "requirements.txt"
         requirements_path.write_text("\n".join(rsp.instruct_content.dict().get("Required Python third-party packages")))
 
-    async def run(self, context):
-        prompt_template, format_example = get_template(templates)
+    async def run(self, context, format=CONFIG.prompt_format):
+        prompt_template, format_example = get_template(templates, format)
         prompt = prompt_template.format(context=context, format_example=format_example)
-        rsp = await self._aask_v1(prompt, "task", OUTPUT_MAPPING)
+        rsp = await self._aask_v1(prompt, "task", OUTPUT_MAPPING, format=format)
         self._save(context, rsp)
         return rsp
 
diff --git a/metagpt/actions/write_prd.py b/metagpt/actions/write_prd.py
index 42c9dd9d1..bd04ca79e 100644
--- a/metagpt/actions/write_prd.py
+++ b/metagpt/actions/write_prd.py
@@ -9,6 +9,7 @@ from typing import List
 
 from metagpt.actions import Action, ActionOutput
 from metagpt.actions.search_and_summarize import SearchAndSummarize
+from metagpt.config import CONFIG
 from metagpt.logs import logger
 from metagpt.utils.get_template import get_template
 
@@ -221,7 +222,7 @@ class WritePRD(Action):
     def __init__(self, name="", context=None, llm=None):
         super().__init__(name, context, llm)
 
-    async def run(self, requirements, *args, **kwargs) -> ActionOutput:
+    async def run(self, requirements, format=CONFIG.prompt_format, *args, **kwargs) -> ActionOutput:
         sas = SearchAndSummarize()
         # rsp = await sas.run(context=requirements, system_text=SEARCH_AND_SUMMARIZE_SYSTEM_EN_US)
         rsp = ""
@@ -230,11 +231,11 @@ class WritePRD(Action):
             logger.info(sas.result)
             logger.info(rsp)
 
-        prompt_template, format_example = get_template(templates)
+        prompt_template, format_example = get_template(templates, format)
         prompt = prompt_template.format(
             requirements=requirements, search_information=info, format_example=format_example
         )
         logger.debug(prompt)
         # prd = await self._aask_v1(prompt, "prd", OUTPUT_MAPPING)
-        prd = await self._aask_v1(prompt, "prd", OUTPUT_MAPPING)
+        prd = await self._aask_v1(prompt, "prd", OUTPUT_MAPPING, format=format)
         return prd
diff --git a/metagpt/config.py b/metagpt/config.py
index 2140334a6..53271133b 100644
--- a/metagpt/config.py
+++ b/metagpt/config.py
@@ -86,7 +86,7 @@ class Config(metaclass=Singleton):
         self.mermaid_engine = self._get("MERMAID_ENGINE", "nodejs")
         self.pyppeteer_executable_path = self._get("PYPPETEER_EXECUTABLE_PATH", "")
 
-        self.prompt_format = self._get("PROMPT_FORMAT", "json")
+        self.prompt_format = self._get("PROMPT_FORMAT", "markdown")
 
     def _init_with_config_files_and_env(self, configs: dict, yaml_file):
         """Load from config/key.yaml, config/config.yaml, and env in decreasing order of priority"""
diff --git a/metagpt/utils/get_template.py b/metagpt/utils/get_template.py
index e374188e0..86c1915f7 100644
--- a/metagpt/utils/get_template.py
+++ b/metagpt/utils/get_template.py
@@ -8,10 +8,10 @@
 from metagpt.config import CONFIG
 
 
-def get_template(templates):
-    selected_templates = templates.get(CONFIG.prompt_format)
+def get_template(templates, format=CONFIG.prompt_format):
+    selected_templates = templates.get(format)
     if selected_templates is None:
-        raise ValueError(f"Can't find {CONFIG.prompt_format} in passed in templates")
+        raise ValueError(f"Can't find {format} in passed in templates")
 
     # Extract the selected templates
     prompt_template = selected_templates["PROMPT_TEMPLATE"]