diff --git a/paddlex/convertor.py b/paddlex/convertor.py
index 937c42c19e8a057fe96b1bd83a7129ec7d4f2680..9aafa8d2d1d6e7e4ca4d434f6799876bdd8ae873 100644
--- a/paddlex/convertor.py
+++ b/paddlex/convertor.py
@@ -31,7 +31,7 @@ def export_onnx(model_dir, save_dir, fixed_input_shape):
 
 def export_onnx_model(model, save_dir, opset_version=10):
     if model.__class__.__name__ == "FastSCNN" or (
-            model.model_type != "detector" and
+            model.model_type == "detector" and
             model.__class__.__name__ != "YOLOv3"):
         logging.error(
             "Only image classifier models, detection models(YOLOv3) and semantic segmentation models(except FastSCNN) are supported to export to ONNX"