Chán's deep alliance was an agreement between the Northern Song Dynasty and Liao after many wars.

When the Liao army arrived in Dingzhou, the two armies confronted each other. Wang Jizhong took the opportunity to persuade Xiao Taihou to make peace with the Song Dynasty. Liao was afraid of being attacked between Scylla and Charybdis, and proposed peace talks, which was initially rejected by Zhenzong. 1 1 month, the Liao army was defeated by Song Jun in Shuozhou, and the Liao army of Kelan army failed to withdraw due to the problem of grain and grass. The main force of Liao army concentrated at the gate of Yingzhou (now Hejian, Hebei Province) and attacked the city day and night. Song Jun Shoujiang Ji bird's nest guarding the city, fighting for more than ten days. LiLin Xiao and Xiao Guanyin slaves led the army to conquer qi zhou, and Xiao Taihou and others led the army to join them to jointly attack Jizhou and Zhou Bei (now Qinghe, Hebei). Song Tingze "wrote a letter to the various overseers, and named the Tianxiong Army of the State Military Association". The Liao army conquered Deqing (now Qingfeng, Henan Province) and surrounded Zhou Zhou (now Puyang, Henan Province) on three sides. Li Jilong, the general of Song Dynasty, guarded the gates of Zhou Zhou. With courage, the United Army of Liao led dozens of Qingqi to patrol under Zhoucheng. Zhang Huan, general of Song Jun, shot an arrow in the head of LiLin Xiao, commander-in-chief of Liaoning Army, and the morale of Liaoning Army was frustrated. Xiao Taihou and others cried when they heard that Tal was dying, so they "stopped working for five days". "Liao History" contains: "There will be a battle with Song, and (Xiao) will be in the crossbow, and our soldiers (Liao soldiers) will lose their support and negotiate peace. Or is the sky tired of its chaos, so that people in the north and south can rest! " At this time, Song Zhenzong and his party arrived at the named state. Kou Zhun urged Song Zhenzong to board the gatehouse in the northern city of Kuizhou to show his bid. "Long live the armies, with a reputation of dozens of miles and a huge momentum." .

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First, the Liao and Song Dynasties were brotherly countries, and the Emperor Sheng Zong of Liao was young, calling Song Zhenzong his brother, and later generations still looked down upon the world with contempt.

2. Taking Baigou River as the national border, the two sides withdrew their troops. (Liao returned to Song Suicheng and Ying and Mo Zhou. After that, all thieves and fugitives crossing the border must not stop hiding from each other. The city at the junction of the two dynasties is as usual, and there is no city god to build.

Third, provide100000 silver and 200000 silk to Liao every year. Delivery to Xiongzhou. Four, the two sides set up a monopoly market at the border to carry out mutual trade. After the conclusion of the Covenant, there was no large-scale war between Song and Liao for more than 100 years. Because Gezhou is also known as Ge Yuan, it is called "Ge Yuan League" in history.