The effect of light emitting diode (LED) light irradiation on the rind and pulp color of ethephon-degreened mandarin fruits was investigated in this study. The effects of LED light wavelength, treatment time and the intensity of the light on the coloration of mandarin fruit were all taken into consideration. LED light treatments can effectively improve the color index, the chromatographic parameters (a*, b*, a*/b* and C*) and the carotenoid content of ethephon-degreened mandarin fruit, and reduced the H* value, the chlorophyll a and chlorophyll b content. Blue LED light irradiated fruit had a better degreening rate and color index. Ethephon-degreened mandarin fruit could develop a better color after a blue LED light treatment at intensity of 300 lx for 10 h.