Abstract: Based on the characteristics of rolling missile with double-channel control,the autopilot loop is transferred from body coordinate system to quasi-body coordinate system after a rolling transfer.Compared with a non-rotating missile standard autopilot,the body and fin servo models of the autopilot are both changed.Couplings of motion,control and the accelerometer placed at a distance ahead of the c.g.exist in the rolling missile autopilot loop.The results show that the autopilot design needs decoupling.