For solving the problem of traditional azimuth measurement based on sine wave magneto-optical modulation which is the useful signal is weak and difficul t to process when the azimuth is little,the paper presents an accurate azimuth measurement method based on two orthogonal linearly polarized light.Firstly,the principle of traditional azimuth measurement method is described,and the reason why the usef ul signal is weak is detected.Secondly,the improvement method is presented,its construction principle is expounded,and the models of two light from modulator are established.We found that the extreme points in alternating current (AC) signal of two light are related with the azimuth,and its phases at same position are opposite,then we let the tw o extreme points at same position to make subtraction to enhance the useful signal and improve the data collection precision.Simulation results show that,compared with that of the traditional method,the amplitude of useful signal related w ith azimuth in the new method is enhanced obviously,and it is favorable to improve data collection precision and azimuth measurement accuracy.