diff --git a/test/main.py b/test/main.py
index 48e7f1c..4ab4efa 100644
--- a/test/main.py
+++ b/test/main.py
@@ -15,6 +15,7 @@ from reportlab.graphics import renderPM
 
 from utils.font_size import *
 from utils.image import *
+from utils.platform import *
 from components.text import *
 from components.rect import *
 from components.common_road import *
@@ -23,6 +24,7 @@ from components.express_way import *
 from components.exit import *
 from settings import *
 
+assert is_windows() or is_darwin()
 
 '''
 obj type:
@@ -188,10 +190,13 @@ with open(svg_file_path, 'wb') as f:
     f.write(etree.tostring(svg_tree, pretty_print=True))
 
 # save as png
-# cairosvg.svg2png(url=svg_file_path, write_to=png_file_path)
-
-drawing = svg2rlg(svg_file_path)
-renderPM.drawToFile(drawing, png_file_path, fmt='PNG')
+if is_windows():
+    cairosvg.svg2png(url=svg_file_path, write_to=png_file_path)
+elif is_darwin():
+    drawing = svg2rlg(svg_file_path)
+    renderPM.drawToFile(drawing, png_file_path, fmt='PNG')
+else:
+    exit(-1)
 
 os.remove(svg_file_path)
 
diff --git a/utils/platform.py b/utils/platform.py
new file mode 100644
index 0000000..8dd3060
--- /dev/null
+++ b/utils/platform.py
@@ -0,0 +1,8 @@
+import sys
+
+
+def is_windows():
+    return sys.platform.startswith('win')
+
+def is_darwin():
+    return sys.platform.startswith('darwin')
\ No newline at end of file