Model Deformation from Poser to Unity

Hi ! I'm new to both Poser and Unity3D. I have a problem when I tried to make an animation and use it in a Unity scene.

My steps are:

1. I used Poser Pro 2014 to make a simple human-running animation and export it as a .dae file (the animation runs good here) ;

2. then open the .dae file in 3Ds Max 2015 and export the animation as a .fbx model (the animation still runs well here) ;

3. use the .fbx model in Unity3D 5.0 (but here, I found that there is a wired deformation of the model and can't find out why) .

After that I tried to skip the 3Ds-Max-step, and use the .dae model in Unity directly, but the deformation still exists as the begining.

The deformation only shows up in Unity, and I really want to know why this occurs and how to fix it, thanks a lot!!!

in Unity:

in Poser: