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In order to improve the monitoring accuracy of laser emission system, proposes a spot center location algorithm based on the four quadrant detector, first using the elliptical model uniformly distributed on the spot to carry on the analysis, based on the four quadrant detector working principle, by calculating the oval spot in the four quadrant detector corresponding areas on the area and derive the spot center coordinate expression, then the analytic geometry method for Elliptic Spot long axis and short axis, finally, four quadrant monitoring system was verified by experiments, the results show that the proposed algorithm, beam monitoring accuracy algorithm can effectively improve the four quadrant detector, compared with the traditional methods, improve the accuracy of 21.3%.