Sorry for I don’t know the exact term for expressing this matter. When an avatar walks, he’s position moves up and down in cycle with foot step.

The problem is when I exported the mesh and skeleton anim to awd2, that info is gone. So the man ‘floats’ forward despite legs moving.

I want to know where the positions are so that I can make him walk normal.

Could somebody at least offer me a keyword for this? I don’t know where to search.

Have a look at these threads.
http://away3d.com/forum/viewthread/3949/
http://away3d.com/forum/viewthread/3935/

The basics is.
With your finished animated skeleton in your 3D app.
Create another bone located at the origin.
Parent your skeleton to this bone.
Then export to Away.

Still think this is a bug, but the above fixes the issue.

Thanks, John! You saved my ass.