The compound parabolic concentrator (CPC) cannot be directly modeled in the TracePro software. According to the characteristics of the TracePro software, the CPC key parameters are analyzed through the mathematical model and the geometric relations among the key parameters are derived. The formulas of CPC parameters in TracePro modeling are obtained. Designing CPC as the reflector cup of LED luminaire is convenient for optical simulation and analysis, with which the product development cycle and development costs are reduced. The formula of theoretical calculation is also given, which makes modeling possible in TracePro software. The result shows that LED reflector cup based on the CPC designed by this method can greatly improve the optical efficiency of luminaires, contributing to the development of the LED lighting industry.