Based on the optical scheme of a two-axis tracking system with high precision,the structure of the four-way body in tracking mount was designed.With finite element MSC.Patran/Nastran software,the linear static analysis of the four-way body was finished.Using a covariance method,surface deflection angles of three reflectors were calculated.The analysis results show that:given the self weight of the four-way body and inner static load,when the pitch angle changes from -90° to +90°,the maximum displacement of the horizontal axis reaches 3.19 μm,which meets the design index；the deflection angle of optical axes caused by structural deformation arrives at 6.90″ increasingly,satisfying the technical index.The results match with experimental data from collimator measurements,indicating the rationality of structural design and the correctness of analysis data.