Rubber scion growth is the key step of rubber budding propagation. However, there is still a lack of systematic studies investigating leaf phenology effect on rubber scion growth. In this study, leaf phenology, stem diameter, plant height and the chlorophyll parameters were observed at six periods. The results showed that leaf-unfolding stage was the rapid growth and regulation stage of plant height and stem diameter, and light green leaf stage was the sensitive to environmental temperature. Taken together, leaf phenology affects the growth speed of rubber buddings, and distinguishing the differences in phenological effects helps to regulate the phenological process to raise rubber buddings.