These studies on epiphytotics of Chinese fir anthracnose (Glomerella ciugulata) were carried out in Jiangxi Province of China during 1974-1975. The disease began to make its appearence at the beginning of April and developed rapidly from late April to late May when the average temperature of ten days rose to 20~25℃. Rainfall and relative humidity likely had little to do with it. Experiments of inoculation with conidium suspension spraying showed that the incubation period ranged from 8 to 17 days and the light deficiency favored the infection. In autumn, only new shoots with chlorosis were infected.The main factor for the epiphytotics of the disease seems to be the unfavorable site conditions for the development of the young Chinese fir, since this disease is of little significance in the native regions of Chinese fir.