Considering the performance and design cost of signal generator,DDS signal generator with high precision and strong stability will be designed based on FPGA.FPGA is programmed by Verilog HDL language to build DDS function module and realize basic digital frequency synthesis function.The design is considered from three aspects,namely,power conditioning circuit at the power supply end,DDS spurious suppression inside FPGA and waveform signal conditioning and filtering circuit at the output end,so as to suppress the spurious problems caused by noise interference and DDS signal modulation in the circuit as far as possible.After verification,the effective value error of the waveform generated by this scheme is 10 mV,and the ripple size is 10.20 mV.It can realize a high-precision and high stability signal generator.