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Multi-channel signal source played an important role in self-inspection and testing system of multi channel data acquisition system. A multi-channel source card combining with PXI bus technology was designed to improve the generality, reliability, scalability and miniaturization; This paper introduces the waveform regeneration hardware module, external SRAM storage module and the software and hardware design of rectangular wave meeting the design requirements. The use of VHDL language for data communication protocol module achieves the communication between FPGA and computer. 