通过设计基于LED光源的自由曲面透镜实现均匀圆形光斑的实例，提出一种快速建立光学器件模型的方法。该方法根据几何光学和非成像光学理论建立透镜的数学方程，由Matlab实现透镜面型数据的数值计算，由TracePro编程完成透镜建模，以动态数据交换（DDE）协议为基础建立Matlab与TracePro间的会话，可在TracePro中自动创建透镜实体模型。仿真结果表明，光通量为100 lm，光源尺寸1 mm×1 mm，视角120°的LED朗伯型光源在5 m远处的目标面上形成半径为3 m的圆形光斑，光斑照度均匀性可达0.7，透镜效率为87%。与传统实现透镜实体模型的设计方法对比，本方法可以简化设计过程，节省设计时间，进一步证明其准确性和可靠性。

By the example of designing freeform lens based on LED light source to achieve uniform circular spot, a new method of establishing optical device model is proposed. According to geometrical optics and non-imaging optics theory, the mathematical model of lens is derived. Numerical calculation of lens surface data is obtained by Matlab, and by TracePro programming the lens modeling is completed, then a conversation between Matlab and TracePro is created with the dynamic data exchange (DDE) protocol. In TracePro, the lens model is automatically created. The ray-tracing simulation results reveal that, the circular spot with the radius of 3 m on the target placed 5 m away is achieved by a LED Lambertian light source which has the luminous flux of 100 lm, size of 1 mm×1 mm and a viewing angle of 120°. The uniformity of illumination reaches 0.7, and the lens efficiency can reach 87%. This method can simplify the design process and save time compared with conventional methods of lens entity model, which further proves its accuracy and reliability.