Normal map display problem with skeletal meshes

I extract the normal map of the sphere from mudbox.
On the Left is the static mesh and it seems displayed correctly.

But after I binded it with skeleton in Maya ,
And imported it as Skeletal mesh,the display of normal map strangely changed as the Right one.

OK,problem solved ,while importing the Normal Import Method is changed to Recalculate, it should be selected as Import Normals :slight_smile: