Abstract: To solve the problem of critical stability or static instability caused by improving the maneuvering characteristics of guided-rockets, three control methods are researched, namely the mere rate-gyro-feedback-loop, the typical acceleration autopilot and the three-loop acceleration autopilot. The result indicates that the rate-gyro-feedback-loop alone makes the system stable but the damp-loop gain is too large to realize in engineering. The damp-loop gain of normal acceleration autopilot can be reduced greatly by introducing the acceleration-feedback. However, the rudder control surface bias will introduce system steady error. The three-loop autopilot not only makes stable for static unstable rocket stable but also it is insensitive to the rudder control surface bias. So the method of three-loop autopilot has priority in the guided-rocket control system.