Abstract: Leaf expansion characteristics of 70 kinds of ornamental plants in Harbin spring were observed, the leaf expansion sequences and color property, as well as their correlation-ship with the climate temperature variation in spring of Harbin were analyzed, in order to study the plant selection range and provide a scientific basis for regional plant color design in Harbin. The results showed that, in 70 kinds of ornamental plants, the first to enter into fully leaf-expansion period were Orychophragmus violaceus (Linnaeus) O. E. Schulz, Viola philippica Cav, Ribes fasciculatum var. chinense Maxim. and Prunus padus Linn.. When the isothermal temperature reached 16益and the daily temperature difference was 10~12益, there were 37 kinds of plant (occupy 52.9%) expanding leaf fully, and could achieve obvious seasonal landscape effect. The leaf color value of NCS distribution in the 26 standard color from NCS S 1070 -G950Y to NCS S 6020 -G70Y, and the trees, shrubs, herbaceous plants covered 3, 11, 13 respectively. The color value of NCS S 3060-G40Y and NCS S 4050-G40Y accounted for the largest proportion, which was 20% and 17.1%, respectively.