In this thesis, we study the technique for LED package, including die bond, wire bond, encapsulation, glass lens attachment and inspection. We successfully make package of two different chips, sapphire-based LED and ThinGaN LED, and compare the power efficiency.Besides, we change the encapsulation styles, including bare chip, flat top with silicon and with lens, to check the change of the power efficiency under measurement and Monte-Carlo ray tracing. Finally, we estimate the internal quantum efficiency by calculating the light extraction efficiency and measuring the external quantum efficiency.