Abstract: Objective The study was designed to supply the early-warning signal for the early discovery Or detection of disease outbreak．Methods A time trend analysis of data from the fever monitoring spots in Hangzhou was carded out．Results The local epidemic influenza from February to March in 2004 was successfully early-warned．Condusion Monitoring of fever symptom is essential for early discovery of the epidemic situation of respiratory tract infection，which is featured by fever，and for taking timely and effective control measures，lowing morbidity rate and reducing economic losses．