The angle measurement of Microwave Landing System (MLS) is studied,and a comprehensive method for improving the accuracy of angle measurement is proposed.In this method,symmetry of the to-and-fro scanning beams is used to suppress multipath interference,the peak detection algorithm based on intersection of straight lines of position is presented to improve angle measurement accuracy,and digital filtering is used to mitigate the impact of noise.The proposed method has been verified by the digital signal processing system based on TMS320F2812 DSP.The testing results show that the method has the advantages of high measurement accuracy,robustness to multipath interference and easy engineering implementation.