In flight test, pressure is an important test parameter which concerns the flight quality and safety. Due to the characteristics and system errors of the differential pressure sensor, the hysteresis nonlinearity introduced in the process of testing calibration has a great influence on the precision of the sensor. The principle and hysteresis nonlinearity of differential pressure sensor used in flight test was introduced. According to the hysteretic characteristic performed in the process of sensor calibration. The hysteretic inverse operator and TS hysteretic inverse model was constructed, meanwhile the cocalibrated data of the sensor was compensated. It was suggested that the inverse hysteretic model had favorable approximation ability to compensate the hysteresis error of sensor on the simulation result and has great significance to improve the test precision of the differential pressure sensor.