Abstract: The Strap-down inertial navigation system and Charge Coupled Device(CCD) can provide corresponding attitude′s data.Fusing these data,integrated navigation system′s error state value can be estimated and the aircraft′s position,velocity and attitude′s angle can be corrected base on Kalman Filtering.The algorithm of integrated strap-down inertial navigation system/star sensor integrated navigation system is educed in detail.The results of computer simulation show that the proposed system is feasible and the algorithm is effective.