It is well known that it is rather difficult to suppress a big number of forming holes on the separator’s tube wall due to its complicated dimension. Through analyzing the process, the author has offered the idea about designing the compression mold in sheet pre-curved rolling process, key points in the structure and working procedures; put forward solutions to the difficulties in each molding technology. Molds designed in the above way can be applied in manufacture and it is certain that the finished products could meet the design and application criteria.