Through the analysis on components of the environment

the essential factors affecting the city illumination

such as human beings

light and objects

are discussed in this paper with the help of environment psychology.On the basis of people's visual characteristics and psychological needs

the characters of illumination of the city in whole

city square

buildings and garden landscape are summarized and the laws of city illumination are revealed.It is found that designing the city illumination should create not only a visual environment but coordination with city spatial elements and physiological sense of human beings

offering a psychological environment in harmony with function atmosphere.The author finally puts forward his thinking on city illumination which combines the natural condition

object form

people's visual characteristics and environmental features based on the environment principle.