The public opinion on public health involves a number of areas，such as medical care，food safety，environment，and so on，and it is related to our country development and people’s livelihood. Through a longitudinal study of a total of 547 public heath events from 2011 to 2013 that produced great impact，it was found that most public health events are negative in nature；the eastern region is the high prevalence area of public health events. Newspapers and online news are the main first-exposure media for public health opinion. The first-exposure media for medical care and food safety public health events were mainly the traditional media，while the first-exposure media for environment public health events are mainly the new media. A majority of public health events last less than two weeks. The key intervention subjects are the local governments and national ministries；the key subjects of news release are the local governments. The doctor-patient conflict，haze，and genetically modified food were the hottest issues of the public health events in 2013.