Questionnaires were distributed and 2004 subjects were involved before and after the Beijing Olympic Games about people’s national identity in this research.The results showed that the level of national identity of Beijing citizens were totally high.It included three dimensions：patriotic feelings，global citizenship，and citizen efficiency.National identity reached a significantly higher level after the Olympic Games.The level of national identity was influenced by gender，age，educational background and career situation.Females had higher levels of patriotic feelings and citizen efficiency than males.Patriotic feelings and citizen efficiency were positively correlated with age.Young people had the highest level of global citizenship while the middle-aged had the lowest.Retirees had higher patriotic feelings and citizen efficiency than the working population.However，the descending order in the level of global citizenship are students，the working population and retirees.