Image quality assessment is essential to the research of imaging performance of laser active imaging system. The quality of laser active illumination image is quantitatively from three aspects of the image, namely noise, gray leveland texture. After deeply study the characteristic of the images, the paper put forward the mathematics models of SNR, brightness, contrast and definition, and the experimental results and analysis are also given. Experimental results show that the quality of images can be evaluated by the parameters objectively, easily and independently.