In view of particularity of common missile's gliding trajectory, in this paper, a glide trajectory scheme was provided based on given height. Considering the common missile using a simple strapdown inertial navigation control program, at the flight speed with few changes or nearly constant vertical velocity, the integrator was adopted for the signal, and the real-time location of the missile can be obtained. So by taking full advantage of the accelerometer of the SSIN, this glide method can be realized by controlling the vertical velocity of inertial navigation systems, then academic discussion and ballistic simulation were conducted. Digital simulation shows that this glide method is reasonable and feasible.