本文给出快速判断光束会聚点位置的三种简便方法，即基于毛玻璃在光束会聚点附近的散班效应的散斑法和几何投影特性的阴影法，以及基于光栅在光束会聚点附近的衍射特性的光栅法。分析了各种方法的判断精度。结果表明，所给出的方法可方便地用于光路调整中光束，特别是激光束会聚点的准确判断 In this paper, we give three simple methods to quickly determine the convergence point of the beam: the shading method based on the scattered-light effect of the frosted glass near the beam convergence point and the geometric projection, and the diffraction characteristics of the grating near the beam convergence point Grating method. The accuracy of various methods is analyzed. The results show that the proposed method can be conveniently used for the accurate judgment of the light beam in the optical path adjustment, especially the convergence point of the laser beam