Abstract: From July 29 to August 20, 2011, an outbreak of brucellosis occurred in a farm in Longyou county in Zhejiang province, 7 cases were reported. The attack rate was 20% (7/35). Bacterial detection indicated that Brucella melitensis biovar 3 was detected in the blood sample of the first case. The importation of large number of non quarantined goats from northern China and lack of effective protection in the farm workers were the major causes of the outbreak.