Chen Ning Yang regards himself as a product of both the Chinese and Western Cultures， in harmony and in conflict， and thinks that his most important contribution is to have changed the Chinese psychology that Chinese is less able than others. Yang has always been an excellent member of the Chinese nation， aware of the duty for China and make contributions to China. From leaving China for studying， working and attaining a citizenship in the USA to coming back to China for residence and working， and giving up US citizenship， Chen Ning Yang has never changed.