Abstract: ObjectiveTo analyze the features of influenza like illness (ILI) epidemics in Hangzhou. MethodsThe data of ILI epidemic in Hangzhou were collected and summarized by influenza surveillance network in Hangzhou, and influenza virus was detected by RT-PCR. ResultsDuring 2006-2007, 67 epidemics of ILI occurred with 2703 cases. The overall attack rate was 3.77%. The epidemic lasted for 5 days averagely (6 days in 2006 and 13 days in 2007). The difference on average epidemic days between two years had statistical significance (Iu/I=-4.37，IP/I＜0.05). A total of 186 samples were taken during the epidemics in 2006 and 2007, and 126 were positive (67.74%). The predominate strain in 2006 was B virus, the predominate strain in 2007 was A3 virus. ConclusionThe influenza epidemics during 2006-2007 in Hangzhou were sporadic ones and local outbreaks, the predominate strains in two years were different.