To bring insight into the non-motor vehicle’s riding behavior mechanism influenced by curb parking, judgment criterion of serious traffic conflict between non-motor vehicle and vehicle (STCNV), non-motor vehicle’s averting danger behaviors and the probability distribution model of the STCNV were put forward and studied based on the survey data on scene. Firstly, non-complete braking distance was presented as the judgment index of the STCNV; the data of traffic conflicts and non-motor vehicle’s averting danger behaviors was collected at the curb parking area; and the deceleration behavior was concluded as the main averting danger behavior. Then, the Poisson probability distribution model of the STCNV was constructed; the safety judgment model for non-motor vehicle’s riding and its critical value calculation standard was proposed on the bias of the Normal distribution, and the safety evaluation was implemented for the survey sections.