An application apparatus combining LED dimmer and reactor, comprises power supply, dimming control circuit, reactor circuit and voltage converting circuit. Output end of the power supply is connected to the dimming control circuit, output end of the dimming control circuit to the reactor circuit, output end of the reactor circuit to the voltage converting circuit, and output end of the voltage converting circuit to electrical loads. In the present invention, a utility frequency reactor is series connected between the output end of the dimmer and the dimmable LED light, and a R.C peak voltage absorption circuit is parallel connected to both ends of the reactor. By switching the phase angle on and off, it is possible to adjust level of output voltage and make light adjustment. Meantime, harmonic current is reduced, and electric grid pollution and line loss relieved, finally energy is saved and pollution is controlled.