The Sino-Japanese Treaty, which was signed on April 28, 1952 and came into force on August 5, 1952, terminated the war status between Republic of China and Japan. Its historical and legal significance, especially the debate on the status of Taiwan derived from the Treaty, have been carefully examined by scholars for decades. Previous scholars nearly focused on the role of Chiang Kai-shek and Ye Gongchao in the negotiation of the Treaty, and the role of the Chinese Mission in Japan was neglected. Although the Chinese Mission in Japan did not directly participate in the negotiation of the Treaty, it successfully lobbied the General Headquarter in Tokyo to pressure Japan to sign the treaty with Republic of China rather than People's Republic of China when the negotiation reached a stalemate. As a section of the research on the Chinese Mission in Japan, this paper examines the role of the Mission in the conclusion of the Treaty.