Abstract: This paper deals with the biological characteristics of the pathogenic fungus of soft-rot disease of oil-tea tree.The optimumtem perature for growth of mycelia of the fungus is 20—25℃,and the optimum pH value is 4.8—5.7.The favorable temperature that the agaric-like sporodochia infects hosts is 15—25℃,the optimum is 15℃,the maximum is 30℃,and the minimum is 10℃.The relative humidity of 100% or near to 100% is necessary to the agaric-like sporodochia infects hosts.The life period of the agaric-like sporodochia is about a month at room temperature.Drying process at lower temperature may prolong the life period.The source of C,N is necessary to the growth and development of the fungus.