根据朗伯光源的特点，定义近朗伯光源函数，设计LED透镜的光学模型，求得LED的截面曲线方程，运用龙格—库塔法求解方程并在MATLAB中使用多项式拟合获得相关数据及修正后的数据，通过Tracepro仿真得到希望的LED近朗伯光源封装模型数据及仿真效果.提出一种LED近朗伯光源光学模型封装的简化设计方法.

According to the characteristics of Lambertian source, an approximate Lambertian source function was defined, an optical model of LED lens was designed, and then a LED sectional curve equation was obtained. Some relative data and modified data were obtained through solving the equation above by Runge-kutta method and a polynomial fitting by MATLAB. The expecting data and simulated effect were extracted from LED approximate Lambertian source encapsulation model by Tracepro. Finally, a simplified designation method for LED approximate Lambertian source encapsulation model was proposed.