[hotboy]

In this picture 2.jpg the right volume was copied from the left volume .The face in the red red Circle of the left volume is an interior face(only one face),but in the right volume there is two face ,that is why?I want the face in the right volume is interior face like the left volume ,what can I do?Thank you very much!

[-mAx-]

sounds like a connectivity problem.
I would connect All Faces

[hotboy]

Originally Posted by -mAx-

sounds like a connectivity problem.
I would connect All Faces

Dear Maxime!
Thank you very much!I'm sorry for the late reply because I was very busy! You said "conect All Faces"? What do you mean ?I have the same geomerys which are very complex .My purpose is that :I mesh one of them.If I can copy the geometry and the mesh together.I don't need to mesh the other geometrys!

[-mAx-]

if you copy volumes which are connected together, it will result of non-connected volumes .
So you have to reconnect the volumes
check my example: on the left, 2 cylinders with split (connected > pink).
I copy both cylinders which are placed on the right (the split is now blue, which means not connected)
Untitled.png

[hotboy]

Originally Posted by -mAx-

if you copy volumes which are connected together, it will result of non-connected volumes .
So you have to reconnect the volumes
check my example: on the left, 2 cylinders with split (connected > pink).
I copy both cylinders which are placed on the right (the split is now blue, which means not connected)
Attachment 40473

Thank you very much!I know that.I work out.