The Social Survey Center of Shanghai Jiaotong University conducted a nationwide telephone survey with the sample of 1080 Chinese netizens from 36 cities，so as to learn about the Chinese netizens’ internet use and information transmission behaviors in public events. We compared the behavior differences between various groups of Chinese netizens，and placed emphasis on the relationship between internet usage，information sharing behavior in public events，and social identification of Chinese netizens. The survey results show that 66.5% of the respondents use mobile phones to access the internet，and the main purpose of internet use is for news and entertainment. The survey results also show that Chinese netizens are concerned about public events and a high proportion of respondents have shared information via various ways in public events. Further research found that the time spent online and social identification were negatively correlated，and the frequency of use of Weixin and social identification are also negatively correlated. It was also found that netizens who have more internet exposure have a lower perception of social harmony and social safety. Besides，netizens who have shared unconfirmed information about public events have a lower perception of social identification.