Dr. Zhu(Chu) is the leader of the research work on Phenology in China. His research works on Phenology in China can he divided into three stages. 1. The first stage was from 1921 to 1931, when he studied ancient and modern phenology in China, and observed the seasonable naturel phenomena by himself. 2. The second stage was from 1931 to 1940, when he worked on establishing phenological observation networks all over China. 3. The third stage was from 1950 to 1973, when he established a new phenological observ-anon network. He made greater contribution to the research works on Phenology in China.