The attitude Angle information of aircraft is an important parameter information in the process of aircraft rescue, but the existence of magnetic interference will affect the accuracy of attitude solution. This article in the attitude Angle algorithm proposed based on extended kalman and the improving method of the linear combination of the kalman, extended kalman filter to update of pitch Angle and roll Angle, while the linear kalman separately for the course Angle is calculated, and join the adjustment coefficient, when the optimal estimate by judging measuring magnetic field and magnetic field Angle to adjust course Angle, the optimal estimate, In order to reduce the influence of external magnetic interference on the heading Angle. Experimental results show that compared with the traditional extended Kalman attitude Angle settlement algorithm, the improved algorithm is more close to the real aircraft attitude information, and has stronger anti-interference ability to the external magnetic field changes.