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Due to the limitation of integrated modification, the total static pressure sensor is difficult to disassemble, which makes it difficult to achieve laboratory calibration. A study on the key factors of total static pressure parameter test, calibration principle and error in the field environment was carried out, and a new on-site calibration method was proposed to solve this problem. In order to verify the accuracy and practicability of the method in the flight test data test, the on-line calibration scheme was used to calibrate the ground test site of the test machine. The results show that the calibration data has high linearity and the basic error of the calibrated sensor is better than 0.1%. After verification by flight test engineering, the calibration scheme can meet the accuracy requirements of flight test data, and provides a new idea for the process and accuracy optimization of airborne parameter calibration.