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The traditional method of calculating the spot center relies on the image itself, and the coupling degree with the actual application environment is low, it also lacks objective evaluation standards. Usually, the average value of multiple shots of the same spot is used to approximate the spot center. In this article, a space laser communication optical antenna subsystem based on non-independent beacon light is proposed. After system calibration, the center of mass method, Hough transform method and circle fitting center detection method are used to evaluate the error performance of beacon light center calculation method through tight coupling with laser communication signal light.The communication signal light is tightly coupled to evaluate the error performance of the calculation method of the beacon center. The experimental results show that under the experimental environment and conditions, the centroid method is more accurate. At the application level, this evaluation method can provide a reference for the selection of the image detection unit.