On the eve of the Washington Conference in 1921,the Japanese Army participated in the preparation for the conference with a relatively positive attitude and formulated the goals of attending the conference and the strategies for dealing with related issues.Furthermore,it did not show obvious dissatisfaction with the results after the conference.However,the Army suddenly changed the above attitude after 1923 and began to criticise the Washington Conference and the Nine-Power Treaty.The main reason for its attitude change was not that the conference reached a resolution that was difficult for the Army to accept,nor that the conference forced Japan to dissolve the Japanese-British Alliance and withdraw some Japanese troops in China.It was because that the Army's cognition and feelings towards the United States deteriorated and it was dissatisfied with the'coordinating diplomacy'conducted by the Japanese Ministry of Foreign Affairs.It emphasised that the Washington Conference damaged Japan's interests in China.Accordingly,the Army formulated the'China Policy Guidelines'in early 1924,requiring the Japanese Ministry of Foreign Affairs to change its diplomacy towards China,which concentrated on the Army's policy requirements of interfering in China's internal affairs and seizing China's resources and reflected its strategic cognition of'there must be a war with the United States'.The Japanese Ministry of Foreign Affairs did not fully agree with the Army's proposition,therefore,the Army initiated its own actions against China after 1924.