A laser cladding process monitoring system was set up based on CCD camera, dynamic behavior of melt pool can be acquired as a video form through the system. The melt pool's digital image is read from the video frame by frame and the steady melt pool area can be obtained. A kind of algorithm was studied and implemented. This algorithm can get the clear melt pool's contour and centroid. Jointed each pool's centroid of the single pass, a relative height curve is formed, and it can approximately describe the deposition's surface. On the basic of the communication between the image collection card and the computer image process cell, a realtime consecutive image process software was developed. The software can accomplish the image collection and process within 0.2 s. These are monitoring elements for finding the actual melt pool position and further laser cladding process close-loop control.