Abstract: Aiming at the cases that the child safety seat is fixed with car three-point seat belt and the child dummy is restrained by a five-point seat belt, the effects of the initial tension of seat belt, the initial position of five-point harness, the overall position of child safety seat and the image recognition method of head displacement on the results of dynamic collision test are quantitatively analyzed by the combination of simulation analysis and test verification. The results indicate that the forward and backward shifts of child safety seat have the most significant effects, leading to a maximum deviation of 4.3% in chest resultant acceleration and 37.7% in chest vertical acceleration. The correction formula proposed reduce the image recognition deviation of head displacement by a wide margin, and the control schemes and measures formulated effectively lower the test errors and ensure the consistency of test data

Key words: child safety seat, dynamic test, influencing factors