Abstract:The paper analyses the principle of tilt sensor’s zero compensation and sensitivity adjustment according to adjusting procedures of the CG-5 gravimeter tilt sensor parameters. An experiment is performed to verify the principle. The results show that the principle analyzed in this paper is correct. Then, a basis for adjusting tolerance of the tilt sensor parameters is proposed. The principle analysis will be helpful for mastering the CG-5 gravimeter. Furthermore, it is useful for optimizing the instrument and secondary development.