In view of the fact that the commonly used blazed grating model can only realize one-dimensional beam deflection,unev en distribution and discrete deflection range,a two-dimensional beam deflection model based on microwave phased array is proposed in this paper.The beam direct ion is controlled by changing phase difference between the electrodes.he lineari ty and coupling of output must be tested before effective beam deflection.The tw o-dimensional deflection precision is analyzed,and the theoretical simulation a nd experimental analysis are carried out.The results show that the precision is less than 14μrad of x direction and 12μrad of y direction within the range of 2.1mrad beam deflection.Finally ,on th e basis of one-dimensional deflection,the effect of phase pattern′s rotation a ngle on deflection precision is experimentally analyzed.Because of the influence s of detector resolution and coupling,improving deflection precision can be used high resolution detector or decoupling technology.