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With the development of human society,more and more people need to work in the room,and room usually use artificial light,such as tungsten filament lamp,all kinds of gas discharge lamp and solid state lighting light source etc.Compared to natural light,artificial light has some lacks.Firstly,it lacks certain ray of natural light( tungsten filament lamp spectrum is the most close to natural light,light efficiency is very low,about 1/10of the LED); secondly,its luminosity and chromaticity is constant,but natural light changes period.Study find that human is living in the natural environment for a long time so natural light stimulus has an important influence on human physiology and psychology.This paper is based on existing chromatic and photometric technology,uses new energy-saving environmental protection lighting LED,to realize maximum simulation natural light technology.Combined with natural light spectrum characteristics and natural light along the Planckian locus changes over time,basing on the law of Glassman color mixing,using a linear equation to calculate corresponding brightness coefficient of the used mixed color light source (lies in two paragraphs of mix light target area of the given Planckian locus),using the brightness coefficient as the dimming control unit input parameters,achieving high quality and along the Planckian locus smoothly output the mixed light.So make the output of artificial light is more close to natural light,not only in light source spectral distribution aspect,but also color,brightness changes also tend to be natural light rhythm,more suitable for physiological and psychological needs of people.