Abstract: Wind angle, wind speed and walking speed, which influence the insecticidal rate of physical insecticidal machine for tea garden, were analyzed by single factor test and orthogonal test. The results of single factor test showed that the best parameters for normal work of the insecticidal machine include a wind angle of 5°, a wind speed of 18 m/s and a walking speed of 0.7 m/s，with which the insecticidal rate reached 81.5%. The results of the orthogonal test showed that wind speed exhibits the biggest influence on insecticidal rate, followed by wind angle and walking speed. The best parameters for orthogonal test include a wind angle of 5°, a wind speed of 18 m/s and a walking speed of 0.9 m/s, with which the insecticidal rate was 80.5%. The results of validation and contrast tests showed that the single factor parameter combination had the best insecticidal effect.