A method for determining the weight of behavior formation factors is proposed to address the issue of their impact on personnel behavior. Review existing methods for determining the weight of behavior formation factors, point out their shortcomings, and construct a method for determining the weight of behavior formation factors based on engineering data. The results show that this method can obtain the weights of the behavior formation factors corresponding to different types of human error, which is more objective and can provide effective guidance for the management of human error and support the quantification of human error probability.