diff --git a/metagpt/const.py b/metagpt/const.py
index 484987a03..c01f92adc 100644
--- a/metagpt/const.py
+++ b/metagpt/const.py
@@ -103,12 +103,13 @@ TEST_OUTPUTS_FILE_REPO = "test_outputs"
 CODE_SUMMARIES_FILE_REPO = "docs/code_summary"
 CODE_SUMMARIES_PDF_FILE_REPO = "resources/code_summary"
 RESOURCES_FILE_REPO = "resources"
-SD_OUTPUT_FILE_REPO = "resources/sd_output"
+SD_OUTPUT_FILE_REPO = DEFAULT_WORKSPACE_ROOT
 GRAPH_REPO_FILE_REPO = "docs/graph_repo"
 VISUAL_GRAPH_REPO_FILE_REPO = "resources/graph_db"
 CLASS_VIEW_FILE_REPO = "docs/class_view"
 
 YAPI_URL = "http://yapi.deepwisdomai.com/"
+SD_URL = "http://172.31.0.51:49094"
 
 DEFAULT_LANGUAGE = "English"
 DEFAULT_MAX_TOKENS = 1500
diff --git a/metagpt/tools/libs/sd_engine.py b/metagpt/tools/libs/sd_engine.py
index aff8ad6b5..4cf7d2310 100644
--- a/metagpt/tools/libs/sd_engine.py
+++ b/metagpt/tools/libs/sd_engine.py
@@ -8,14 +8,13 @@ import base64
 import hashlib
 import io
 import json
-import os
 from os.path import join
 
 import requests
 from aiohttp import ClientSession
 from PIL import Image, PngImagePlugin
 
-from metagpt.const import SD_OUTPUT_FILE_REPO, SOURCE_ROOT
+from metagpt.const import SD_OUTPUT_FILE_REPO, SD_URL, SOURCE_ROOT
 from metagpt.logs import logger
 from metagpt.tools.tool_registry import register_tool
 
@@ -69,7 +68,7 @@ class SDEngine:
         Args:
             sd_url (str, optional): URL of the stable diffusion service. Defaults to "".
         """
-        self.sd_url = os.getenv("sd_url") if sd_url else sd_url
+        self.sd_url = SD_URL if not sd_url else sd_url
         self.sd_t2i_url = f"{self.sd_url}/sdapi/v1/txt2img"
         # Define default payload settings for SD API
         self.payload = payload
@@ -180,9 +179,3 @@ def batch_decode_base64_to_image(imgs, save_dir="", save_name=""):
     for idx, _img in enumerate(imgs):
         save_name = join(save_dir, save_name)
         decode_base64_to_image(_img, save_name=save_name)
-
-
-if __name__ == "__main__":
-    sd = SDEngine(sd_url="http://172.31.0.51:49094")
-    payload = sd.construct_payload(prompt="a girl")
-    sd.simple_run_t2i(payload=payload)