结合高能激光束硬边光阑发射时远场的分布特性，对探测器动态范围在光束质量β因子测量中的影响进行了理论分析。对近衍射极限光束质量测量不同动态范围探测器的影响进行了数值计算，根据计算测试误差给出了探测器动态范围的最低推荐值。实验验证模拟结果的正确性。

Based on the far field distribution character of high energy laser, the influence of different dynamic-range detectors in laser beam quality factor β measurement is discussed. According to numerical calculation of different dynamic-range detectors in the diffraction limit beam quality measurement, the lowest value of dynamic-range is recommended. The experiment demonstrates the correctness of simulation result.