Abstract: The tilt of vehicular platform will have the biggish influence on the angle measuring precision of optical measurement equipment, in order to eliminate this effect, the encoder measurement of tilt was proposed to measure the tilting angle of vehicular platform, and correct the angle measuring error afterwards. Firstly, the reasons of tilt of vehicular platform was analyzed when the optical measurement equipment was working. Secondly, the encoder measurement of tilt was used to measure the tilting angle of vehicular platform, and send the data to the master computer. Finally, according to the different characteristics when the optical measurement equipment was stationary and working, the storage data was carried to process through sliding mean filtering and sliding weighted mean filtering, the processed data was used to correct the angle measuring error afterwards. Experimental results show that the data through filter by the encoder measurement of tilt, reducing the impact by noise to the tilted data, improve the usability of data. It establishes foundation for the next of angle-measuring error emendation model of the optical measurement equipment.