problem with zbrush displacement map

[icmforever]

I'm doing practices in zbrush 3.12 in mac.
After i finished the model in zbrush, i used GUV mapping.
i tried to render it in maya, but there are many lines on my model after the displacement map was added.
no matter i use PUV, GUV or made a UV myself, these lines are still here.
Is it the UV problem?
or did i miss some steps in zbrush and maya?