Expect to satisfy basic visual task,the chief purpose of lighting in commercial pedestrian streets is to create more comfortable,more active and interesting environment.This paper analyzes main characteristics of visual perception,such as the attributive stage,expectations of perception and final response to the environment,and tries to discuss object and demand of lighting in commercial pedestrian street based on principles of visual perception.In this paper,first,frame of reference about visual perception is presented;then,the cause of lighting environment design is put forward;finally,some elements of lighting design in commercial pedestrian streets are ascertained.