The rapid development of city lighting and the population of LED have brought us excessive artificial outdoor light. Now there is no effective limitation for it. Based on subjective survey and objective measurement, we got the residents’subjective evaluation and the optical parameter of the light trespass, and identified 4 trespass sources, 5 classic factors(brightness, color, dynamic mode, light-emitting time and area) and 3 major trespass types (brightness trespass, colored trespass, dynamic trespass)of light trespass. And the parameter range was given to the main trespass factors of the 3 types light trespass.