o! thank you for response nowayfra.
I already did so.after it i delete the history of the object and preserve polySmoothFace. then i create a null mesh node and add it to hypershade graph. then take a baked mesh node, connect his outMesh to my polySmoothFace's inputPolymesh and polySmoothFace's outMesh to my null mesh's inMesh.then make the first mesh intermediate object from attribute editor>Objject display.after this i connect the last object's inst.objGroups to my material's dag.setMember. FINAL :))...
now i write an automation script for this process.