Abstract: In the period of 1994~1997, by using method of spectrophotometer (method of spectrology), wecarried out physiological data measurement for photosynthesized pigmentum and flower pigmentum content of leaves themselves of 8 varieties of color leaf tree in growth seasons, drew curves for changing of photosynthesized pigment content along with the time changes and in this we have found the internal reason of the leaf color changings in different seasons.It is because of the relationship between content of photosynthesized pigentum and the ambient temperature, the variations of external factors, including the intensity of sunlight, and length of sunshine lead to a color changing in leaves.

Key words: Color-leaf tree, Photosynthesis pigmentum, Spectrology, Pholosynthesis curve, Variation of leaf color