Effecting by environment, light intensity and photography distance, video monitoring image usually become blur and difficult to distinguish small characteristic in image, which influence the apply value. To solve this problem, a multi-strategies controllable compositive image enhancement system for complex environment is designed. This system fuses multiple enhancement strategies to enhance blurred monitoring image under different environment factor. The experimental results reveal that this system can realize effective unification of enhanced efficiency and enhanced effect, which make system achieve optimum performance, thus improve the apply value of monitoring system extremely.