Aimed at the influence of sight line translation during marching on remote control weapon station (RCWS), an angular velocity solved to compensate by using the existing sensors. Analyzed the shortcomings in the process of mathematical deduction of compensation angular velocity, put forward an approximate solution method according to geometric relationship, deducted the approximate solution formula, and contrasted the approximate compensation angular velocity with the truth value at different shortcuts by Matlab software. The results show that compensation error and error rate meet the demand of precision, and satisfy actual application.