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In this paper, for two dimensional size and angle of mobile U disk, an image processing methods was presented.It realized a non-contact measurement of the length and angle on mobile U-disk. Based on edge detection, it adopted Hough transformation to detect and locate the straight edge line of Usb chip through the backlighting image of Usb chip photographed by the COMS industrial camera.In the case that Hough transformation might detect to multiple straight lines on one straight edge.The method of linear parameter on average to fit the edge of a straight line was presented. so as to obtain accurate edge positions. Through the known size block for camera calibration, we can calculate the exact size and the angle of inclination of the Usb chip.The experimental results show that this algorithm can meet the detection requirements for higher accuracy in engineering.