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Aiming at the problem that the traditional multi rate signal is nonlinear distortion, and the adjustable difference, a new design scheme based on FPGA and DAC5682 is proposed. Program focuses on the implementation DAC5682 digital-analog converter module and multi-rate signal processing algorithms. DAC module can achieve 4-channel digital-analog conversion, the sampling rate can reach 1Gsps. Meanwhile, in order to verify the reliability of FPGA algorithm design, paper first platform through MATLAB algorithm for the simulation modeling and analysis; Then the algorithm is transplanted to the FPGA circuit through the hardware description language, and the simulation is realized in Modelsim; Finally, the simulation waveforms are given. Through simulation, the transmitter has a good filtering effect, and the flexibility of the baseband frequency and transformed mixing modules to transform and upgrade based on actual demand. Through the design of FPGA+DAC, the structure of the system is simplified, it can also be more efficient implementation of the technical indicators in the system. The system can be widely used in mobile communication systems.