Based on the 4-phase modulation scheme, the channel and angle measurement of tracking sysetem are designed and simulated in thia paper and the influnence of the channel phase consistency and SNR on angle measurement performance is analyze. The result shows that the performance of angle measurement is sensitive to the channel phase consistency through the simulation analysis in the monopulse tracking receiver. Considering the engineering practice and the specific system parameters, the conclusion is drawn that azimuth and elevation error percentage are less than 1/10 when the phase difference of the sum-difference channel and the phase shifter changes in the range of [-3 3] and [-5 5] at the same time SNR is less than 0dB.