In order to solve the problem of CNC programming in manifold block, the method of automatically programming was proposed based on Edgecam. The method of processes planning, machining feature recognition and CAM operation construction were studied, the rapid programming system was designed with VBNET and such redevelopment tools as PCI，PDI in Edgecam. Finally, the effectiveness of the proposed method is validated by the case, which provides reference for post processing in other machine tool.