Different light quality have different effects on the growth and development. This paper studies the different affects of the red, yellow, blue, purple, green and white on Viola tricolor＇ s flowering, leaf area, plant height and crown width. The results show that the red light could induce Viola tricolor to blossom earlier, and short the cycle time of flowering. The blue light could induce Viola tricolor to blossom lately and delay the cycle time of flowering. The red light could help Viola tricolor to accumulate the organic matter, and the green light could inhibit accumulation of organic matter. The green light could promote the growth of plant height, the purple light could inhibit the growth of plant height. Viola tricolor＇ s leaf area will be large on the condition of blue, purple and green lights, and smaller on the condition of red light.