Abstract: The paper discusses the population dynamics of the adult, nymph and egg density of small green leafhopper (SGL), the influence of temperature and humidity on the population dynamics of the SGL at the tea garden of Fujian Agriculture & Forestry University, Jinshan, Fuzhou, Fujian, 2007. The results showed:①The population dynamics of the SGL had two peaks, a significant positive correlation was shown among the population dynamics of the egg, nymph and adult of the SGL.②The population dynamics of the adult, nymph and egg density of the SGL was significantly affected by the temperature during the occurrence. While the average temperature above 28℃and lower 20℃ condition, the population dynamics of the SGL were declined rapidly.③The temperature for the dynamics of the adult, nymph population and egg density of the SGL were coincided with the Yield Density model.