Abstract: Aiming at the problem of large track deviation detected by airbone warning radar system in the turning period of airbone early warning aircraft during test flight, the coordinate transformation model of the attitude of the aircraft, the angle of early warning radar and the detection track data was established, and the influence mechanism of track deviation was analyzed. Firstly, the relationship between the platform attitude change and the projected position of the detection target is analyzed in the case of angle measurement error of the early warning radar system, the coordinate transformation matrix is established, and the simulation program is written. Then, the actual flight data is used for simulation operation, and the simulation results are consistent with the actual detection of the early warning radar. The analysis results prove that the main causes of the track deviation is systematic error of angle measurement, clarify the error transmission path, and help to promote the development and improvement of airborne early warning radar system.