I’m new to zbrush and was wondering if somebody here might be able to answer my question or point me in the right direction.
Excuse me, I can’t speak english very good, but I can show my problem with images.
use goZ to fix your problem
your answer was short but so helpful!.. thank you very much :)… but there was a problem… when I go to 3ds max, low poly model edges are on normal map yet!.. why this happen on normalmap? 
upload your new generated normal map as well please.
You are generating your normals inside of Zbrush correct? Do they look broken in Zbrush when you generate your normals still?
Try this.
go to Zbrush, export your model to max with goZ.
apply a UVW unwrap on your model and check to make sure everything is welded together in your UVs as they should be.
collapse the stack.
export your model as a lowpoly .obj file
goZ back to Zbrush.
generate new normals and see if that fixes the problem.
if not.
go to your lowest subD level.
tool.import.select the model you just exported from max
now generate new normals and see if that fixes it.
thanks Dear beta chanel. I found the point!.. when I turn on button of “snormal” before getting the normal map, the lowpoly model edges vanished from the normal map 
…I didn’t know it’s necessary click on snormal button… I’m new to zbrush, Sorry if I ask strange questions. :o