In order to understand the increasing incidence rate of Brucellosis, the relationship between the epidemic trend and physical conditions of humans, data regarding Brucellosis in Liaoning province, in 1990-1996 was analysed. Results showed that the major cause which led to the Brucellosis recurrence was the importation of sheep named short-tail cold-resistant. The distribution of disease was widely spread. However, most endemic foci were being expanded. The spots in Tieling and Fushun area were merged and became one endemic area. Brucellosis maily involved in the farmer's family that raise sheep while pregnancy make women at reprodactive age susceptible to the disease. The incidence rate in city and rural areas were significantly different despite that they had the same environment that bacteria-carrier sheep were raised.