为了研究光源面分布对激光针灸经穴组织的漫反射传输影响，利用激光针炙在穴位组织中虚拟点源的镜像点源分布函数、并引入格林响应函数，外推边界条件求解得到点光源的漫射方程解，由人体穴位4层介质组织的一系列虚拟点源的响应得到不同空间分布光源下人体穴位的激光针炙漫反射模型; 采用蒙特卡罗方法模拟了圆平面、光纤及高斯分布的面光源激光针灸。结果表明，无光斑时3种光源的径向光能主要集中在近激光针灸点区域，径向距离大于0.135cm，3种光源卷积曲线重合，圆平面和高斯光源的轴向光能呈负指数衰减，光纤光源呈直线下降; 存在光斑时面光源的漫反射与光斑面积成反比，等光斑面积下圆屏光斑比圆环光斑的组织漫反射大，光斑垂直投影处漫反射曲线存在明显畸变，投影外畸变与距离成反比，达到0.5个光斑半径距离时畸变基本消除。该结果可为穴位针灸的光源选取与针灸定位提供有益参考。

In order to study the diffuse transmission influence of laser acupuncture with different surface distribution light sources, the image-point-source distribution on meridian tissue is analyzed and diffusion equation of the image-point-source is solved through the use of extrapolation boundary conditions and Green response. Diffuse output models in acupuncture region for different distribution surface light source are obtained by a series responses of virtual points source. Flat, fiber and gauss acupuncture laser are simulated by Monte-Carlo method. The results indicated that: (1) the radial light energy in three acupuncture without spot mainly was concentrated in the near light source region and coincided when the radial distance to more than 0.135cm, and axial light energy showed a negative exponential decay in flat and gauss acupuncture and linear decline in fiber source; (2) when surface light source existed circular or ring spot, the diffuse was inversely proportional to the spot area, especially the diffuse of circular spot being larger than the ring spot under the same spot area, and diffuse reflectance curve had a significant distortion at the vertical projection and was inversely proportional to the distance outside the projection, especially when the distance to 0.5 times of the spot radius the curve distortion being basically eliminated. The results may provide a useful reference for light source selection and acupuncture location of acupuncture points.