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American values, with the development of history is constantly changing. The 9/11 attacks on American history has important influence. The traditional American values in the aspects of September 11th and also has undergone some changes. These changes will help better understand after September 11 times and the American public opinion of some policy change. Through the analysis of the paper states patriotism, diversified culture, American immigrants, and American individualism security aspects in September 11, discusses the change after 9/11 for American values.

the values of USA changes constantly with the development of history.the 911 event is of vital effect on american history process.And all aspects of the traditional values of USA changes a little after 911 in contrast with that before 911.Analyzing those changes will help to under the profound reason why the american public media and some american policies change a lot during post-911 time.By analyzing the changes in aspects such as american patriotism、culture diversity、american migration、individualism and security opinion，the article aims to make discussion on effect of 911 event on american values.

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