The solid model of the C/ E composite trellis wound structure and the mold of the sturcture were created by a 3D design software through deduction of the cylindrical helix and conical spiral parameter equation. Space correspondence can be realized on the base of the 3D model of the sturcture. It can reduce the development cycle and the development cost. It also can increase efficiency. The mold design method is feasible and is a kind of practical mold processing method.This method has been applied in project design.