Rotating paraboloid mirror mosaic structure antenna has important applications in the multi- point space laser communication. Different rotating paraboloid base surfaces result in different communication ranges.The relationship between the parabola coefficient p and communication range θ with different effective apertures is discussed rationally. The results show that the maximum communication angle can achieve 118.7377° ，where the parabola coefficient p is 28 in the reasonable range. However, because of restrictions coming from the following system, the surface need to be a reasonable choice that the parabola coefficient p is 50, and the maximum communication angle is 109.8084°.