A design of low phase noise reference signal generation module is introduced in the paper. Through the design and analysis of the circuit, the corresponding analytical method and test results for actual object are given. The test results show that the phase noise is -128.6 dBc/Hz@1 kHz at 4.2 GHz and -121.6 dBc/Hz@1 kHz at 12.9 GHz. All indicators meet the requirements well. As far as the situation is concerned, the module has been well applied to the radar.