Water-entry trajectory control of air-dropped vehicle has always been the focus of airdropped vehicle research. Aiming at the problem of water-entry trajectory control of air-dropped vehicles，this paper establishes the six degree of freedom nonlinear dynamic model and motion model of vehicles. According to the attitude control requirements of water-entry trajectory，this paper designs the three channel attitude control strategy which is based on PID control to solve its water-entry control problem，and simulates and verifies this design by MATLAB. At last，the results show that this control strategy can control the depth and attitude of vehicle well under different initial water-entry condition，and it has a certain practical application value.
