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Light weapons acceptance is one of the most important factors, that hit targets on the accuracy, the aiming system accuracy has a direct impact on performance of weapons to play, and the traditional calibration device can only be accomplished with weapons of coarse alignment. So design a new light weapons electronic aiming system. The core of the design is the construction of the accurate recognition algorithm in the figure. In constructing algorithm, through the introduction of regular hexagon search window and gradient direction information criterion to improve the randomized Hough transform algorithm, to make up for the existing Hough transform method for computing complex degree is high, occupies large memory. Fully validated in Matlab excellent effect of improved algorithm, the algorithm was transplanted to the embedded software environment of electronic aiming system, by testing the surface electronic aiming system on the muzzle of the center position and bore center point and cross cursor relative position, showing excellent performance calibration, the initial realization of fine calibration of gun system. In the calibration process, not directly in contact with light weapons can avoid the traditional aiming system repeats the installation on the barrel caused by wear, provides a new method for traditional methods of calibration.