In order to overcome the defects of single function, low processing efficiency, high stopping rate and so on in the traditional mechanical-type flat head lockstitch button holder, developed a high-performance flat head lockstitch button holder NC system. The system uses a master and slave architecture, ARM9 embedded industrial control computer is used by host, WINCE operating system, the use of touch-screen by human-computer interaction is responsible for visual sewing and programmable choice of keyhole pattern. Machine dependent which uses large-scale integrated circuits is composed of DSP and FPGA which based on ASIC design method for high-precision motion control. Through prototype debugging, each module features of the system have been tested, the system greatly enhance the production efficiency.