Abstract: In order to explore the effect of different light quality and light intensity on the color of Tia leaves, the light quality and light intensity suitable for Tia color change were obtained, and the ornamental value and economic value of Tia were improved. By covering different layers of shading net and using four different light sources - red light, blue light, white light and natural light - to create different light intensity and light quality conditions, the contents of Netia anthocyanin, chlorophyll and the color changes of Tia leaves were determined. The results showed that the color of Tia leaves was the best and the growth was good when they were covered with a layer of sunshade and the shading net were red and green. Without shading net, the color was mostly red, less green with better color and burning phenomenon. In the light quality experimental group, the red light had a great influence on the color of Tia leaves, the red color of leaves was the majority in the red light environment followed by the red light. The white light had little effect on the color change and the color change was not particularly obvious.

Key words: tia, light intensity, shading net, chlorophyll, anthocyanin