On this day 90 years ago, on June 27, 1935 (the 27th day of the fifth lunar month), China and Japan signed the "Qin-Turkey Agreement".

On June 6, 1935, four people including Yamamoto, a confidant of the Japanese Kwantung Army's secret service in Abaga Banner, Inner Mongolia, sneaked into the territory of Chahar and secretly drew maps. They went to the north gate of Zhangbei County. They refused to accept the inspection of the guards of Zhao Dengyu's Department of the 132nd Division of the 29th Kuomintang Army. They were sent to the Military Justice Department of the Division Headquarters for detention and released eight hours later.

On the 10th, Japanese Consul in Zhangjiakou, Hashimoto, and Chief of the Chahar Secret Service Agency, Gennosuke Matsui, used the excuse of "insulting" Japanese soldiers by the China army. Protest to Qin Dechun, deputy commander of the 29th Army, and reply within 5 days, otherwise the Japanese army will act freely. The Nanjing government succumbed to Japanese pressure and removed Song Zheyuan from his post as member and chairman of the Chahar Provincial Government on June 19, and appointed Qin Dechun as acting chairman of the Chahar Provincial Government. Qin Dechun and others began to hold negotiations with Japanese representatives Tufei Yuan and others on June 23.£¨£©

On June 27, China and Japan signed the "Qin-Turkey Agreement". Its main contents: (1) the Song Zheyuan troops stationed in the Changping and Yanqing frontline were transferred to its southwest region; (2) the anti-Japanese organization was disbanded; (3) the person responsible for the Zhangbei incident was punished; (4) the Shandong immigration was stopped through Chahar Province; (5) military and political consultants were recruited from Japan; (6) the activities of the Japanese secret service and the establishment of military equipment were created and assisted.

The signing of the Qinhuangdao Agreement caused China to lose most of its sovereignty in Chahar Province and 70%-80% of its territory. This agreement, together with "He Mei Waoding", opened the door to Japan's annexation of China and North China.