Laser active imaging radar over a wide depth of field and complex-scene target imaging process, because the remote target echo-signal amplitude is smaller, resulting in a lack of effect on the intensity image, and affecting the target detection and recognition rate. Aiming at this problem, the detection of laser echo pulse width to generate laser two-dimensional image is put forward, which is called the pulse-width image, and the pulse-width image is used to detect the wide depth of field and far-reaching distance target. Using the streak tube laser imaging radar scan imaging experiments on multiple building group, the intensity image, range image and pulse-width image are obtained respectively. Analysing by statistical data, the results show that the visual effect of the pulse-width image is better than the intensity image, relative to the intensity image, the pulse-width image can clearly show the far-field targets; for different buildings, the average value of echo pulse width are different, and the beam incident angle, target material is closely related with the echo pulse width: white walls of two different-incident angles, the echo pulse-width difference is 2, the pulse-width of glass and the pink wall differ by 4.7, while the target color (white, pink) has little effect on the 532nm echo pulse width, the difference of pulse width is only 0.2. It proves that the pulse-width image can effectively improve the wide depth of field and far-reaching distance target detection rate.