Abstract: The Yalta Conference reached an agreement on the secret business about China back against the Chinese Government and her People. However, long after the conference, the American government did not inform the contents of the above mentioned agreement to the Chinese government, and further suppressed the contact and talk between the Soviet Union and China as well......Under the circumstances that the American government and the Soviet Union government had reached a kind of compromise on the issue of anti Japan war and postwar cooperation in China especially in the Far East, the Kuomintang government's diplomatic endeavor failed completely.