Hi Kejun,
Can you confirm if your model exports or not?
Unfortunately Jules' methods are the only way you are going to find the degenerate faces that are preventing the export.
This may mean going through a process of elimination - detaching parts of your model and seeing if those smaller parts will export, until you find the parts that won't export.
The only other option is to remodel, being careful about not overlapping lines and vertices as you go.