为了研究贝塞尔－高斯光束通过圆孔硬边光阑和圆环光阑的衍射特性，从Collins公式出发，采用数值模拟的方法模拟出光强分布。模拟结果表明，贝塞尔－高斯光束经圆孔光阑衍射后轴上光强随菲涅耳数F呈周期振荡；贝塞尔－高斯光束经圆环光阑后轴上光强随F呈振动衰减。在F相同时，贝塞尔－高斯光束经圆孔光阑衍射后横向光强分布比经圆环光阑衍射后横向光强分布平滑，孔径越小，光强调制越明显；当孔径与束腰相等时候，横向光强分布与菲涅耳数没有关系。

From the Collins formula,the diffraction of Bessel-Gaussian beam passing through circular and annular apertures was studied based on numerical simulation. The results indicate that the axial intensity of Bessel-Gaussian beam through a circular aperture changes with the Fresnel number F periodically;the axial intensity of Bessel-Gaussian beam through an annular aperture attenuates with the F at the function of vibration. When F is the same,the transversal intensity of Bessel-Gaussian beam through a circular aperture distributes more smooth than an annular aperture. The smaller the annular aperture,more obvious is the modulation of transversal intensity;when the annular aperture is equal to the waist of the beam,the transversal intensity is independent of the Fresnel number F.