He was the eldest son of Sartaqtai and Qujiyan of the Qongirat and a grandson of Orda Khan.
Since 1280 he sent friendly letter to Kublai Khan, and the Yuan dynasty rewarded him a large amount of grains and other valuable things of China in turn for his alliance.
Köchü possessed the territory of Ghazna and Bamiyan under the suzerainty of either the Chagatayid Khans or the Ilkhan.
[1] However, he proved his alliance and refused when Baraq, ruler of Chagatai Khanate, demanded him to give up the authority of those areas before his attack on Iran in 1269.
When the Borjigin princes, who operated on Kublai's behalf in Central Asia and later on rebelled, fought against each other, they appealed to Köchü.