主要对蓝光、绿光、白光LED的色度特性进行分析，首先通过单色仪，分别测得蓝光、绿光、白光LED的相对光谱功率分布并以色度学理论为基础，计算出光源主波长、色纯度、色温和显色指数.计算结果表明：蓝光LED和绿光LED主波长随标准光源的不同变化不大，色纯度比较高，分别在0.64和0.87左右，一般显色指数为-29和-14，显色性很差，不适合用来做照明光源.白光LED主波长随标准光源的不同变化较大，色纯度相当低，接近0，一般显色指数为82，显色性很好，完全符合照明光源的要求.

In order to study the color characteristics of light-emitting diode, the characteristics of blue, green and white LED colors are analyzed. Firstly, the spectral power distribution of blue, green, white LED is respectively measured by using the monochromator, and then on the basis of the theory chroma, the main light source wavelength, color purity, color temperature and color rendering index are calculated. The results show that blue LED and green LED dominant wavelengths change little with different standard light sources, and the color purities are relatively high, at 0.64 and 0.87, respectively, the general color-rendering is very poor for the index of -29 and -14, so these blue and green LED are not suitable to be used as lighting source. White LED dominant wavelength largely change with different standard light sources, and color purity is relatively low, near 0, color rendering is good for the general color-rendering index of 82, so white LED is in full conformance with the lighting requirements.