TracePro software and goniophotometers are used to carry out the optical simulation and experimental researches on LED, respectively. Comparing the test results with the simulation results, the accuracy and feasibility of the simulation method are verified. TracePro is used to carry out the optimization of secondary optical simulation for high power LED. Results that show the optical performance of high power LED has been greatly improved by the optimization optical design. The lighting effect is more ideal, and the light uniformity is much better.