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In the calibration of the pedal force testing system, the conventional method is to remove the testing system for calibration, which is easy to cause sensor damage and low efficiency. In this paper, the measuring principle of the pedal force sensor and the influence of the power supply voltage on the output of the sensor are studied, and a new on-line calibration method of the pedal force testing system is proposed to solve the above problems. The calibration results show that the calibration curves based on the two calibration methods are basically the same, with the maximum deviation not exceeding 0.15% of the total measurement range, which meets the requirements of airborne test accuracy for flight tests. The results show that the calibration method is accurate and reliable, and can be applied to the calibration of airborne pedal force testing system.