A novel approach of printed circuit board(PCB)image locating is presentedBased on the rectangle mark image edge of PCB,the featur es is used to describe the image edge and the fractal properby of image edge is analyzedIt is proved that the rectangle mark image edge of PCB has some fracta l featuresA method of deleting unordinary curve noise and compensating the l ength of the fractal curve is put forward,which can get the fractal dimension value from one complex edge fractal property curveThe relation between the dim ension of the fractal curve and the turning angle of image can be acquired from an equation,as a result,the angle value of the PCB image is got exactlyA real image edge analysis result confirms that the method based on the fractal theory is a new powerful tool for angle locating on PCB and related image area