The edge detection operator of the spot has an important influence on the quality of a laser spot,and is the premise of subsequent image processing and analysis of the laser spot.At present,the most widely used edge detection operators at home and abroad are Roberts operator,Prewitt operator,Sobel operator,Gaussion-Laplace operator and Canny operator.On the basis of summarizing several typical edge detection operators,this paper compared and analyzed the advantaged and disadvantaged of each operator,and forecast the improvement direction of future operators.