1921年顾维钧代表中国政府出席了华盛顿会议，为山东悬案的最后解决与日本代表团进行了针锋相对的斗争，从而为他从1915年起就热情关注、并在1919年巴黎和会上力主拒签《对德和约》而使之成为悬案的山东问题争得了一个较为圆满的结局。巴黎和会之后，帝国主义国家之间的矛盾， In 1921, on behalf of the Chinese government, Gu Weijun attended the Washington Conference on behalf of the Chinese government and conducted a tit-for-tat struggle with the Japanese delegation for the final settlement of the overhaul in Shandong, thereby giving him a warm concern since 1915 and refusing to sign a ballot at the 1919 Paris Peace Conference. The peace issue in Shandong that made it a pending case won a more satisfactory conclusion. After the Paris Peace Conference, the contradictions among the imperialist countries,