Abstract: To solve the problem of workload and low measuring accuracy in existing calibration method of traffic speed deflectometer,a new calibration method based on measurement method was proposed. The new calibration method changed Doppler laser position by step process to making all doppler laser sensors outside the scope of deflection basin and the corresponding improvement scheme for equipment construction was put forward. The test results show that the calibration method has better precision from evaluation indicators of relevance,Pearson correlation coefficient and the measured deflection basin slope curve than that of existing calibration method,and the measurement result is an approximation of Backman beam to ensure the quality of the deflection measurement. The new calibration method has a good practicability and the maneuverability is strong because it spends less calibration time.