why I can see the edge of polygon of dts model in TGEA?

#1 Are you really using TGEA or T3D ?

If your using T3D try exporting as .dae (use open collada plugin)
github.com/KhronosGroup/OpenCOLLADA/wiki/OpenCOLLADA-Tools

I only use the dts exporter for player models, as I sometimes get odd smoothing when exporting static models as dts.

hth,
Hewster

#2 This is because the model has a bad UV projection. If you are using 3DS Max, you can add an edit uv modifier and correct the problem. Honestly though, by looking at your model, you probably did a booleen operation to make windows, this did oddball stuff to the polys once you sent it to T3D. I really should do a proper tutorial on how to contruct walls and windows, boolean operations are not the right approach for low poly. You are better off using lines, drawing your walls, draw where you want the windows, attach the lines together, and extruding it to create your facade. It's a 3DS Max issue.... has been for years.

Ron

#3 Yeah - I've also fixed this by selecting those faces and using the "unify normals" button.

If you preview render before export you should catch this before it even hits the game unless Autodesk has changed the renderer.