In view of the problem that the large azimuth installation error angle of the horizontal sensor will lead to the extension of the leveling time, this paper briefly describes the four-point leveling strategy and the working principle of the dynamic horizontal sensor, and establishes the coordinate matrix and matrix conversion relationship, and discusses the influence of the azimuth installation error of the dynamic horizontal sensor on the leveling system. The test results show that the method of making the shafting of the dynamic level sensor parallel to the shafting of the mounting base can reduce the azimuth mounting error angle and improve the system performance.