Aimed at the deficiency of the manufacturing technology in traditional large and complex disappear mould (EPC), the digital based forming technology was developed. The control system was adopted of two levels control structure of the IPC and PMAC, and did the research about PMAC motion control implementation. The software were developed of the program by VC++ on Windows platform including the communication program of doublelayer structure, manmachine interface (MMI) management procedures and the underlying motor control program of PMAC control card. Research was conducted of the prospective optimization control strategy based on processing requirements which contained the high speed and big feed movement of EPC on micro straight line with small cutting force, which realized the adaptive optimal control of interpolation machining path and verified the result of interpolation optimization. The results show that the technology after optimization saves 167 s in machining time, the accuracy of machining curved surface reaches at 001 mm, and cuts short of the development cycle of complex mould for singular part in a small batch.