Razang Khan, whose real name is Razang Rubei (hereinafter referred to as Lazang Khan), surnamed Borzigit, is the great-grandson of Gushi Khan Tulubaihu, the founder of the Heshute Khanate. In the 40th year of Kangxi (1701), the Dalai Khan died (the grandson of Gushi Khan and the father of Razang Khan), and Lazang Khan attacked and killed his brother Tenzin Wangjie to seize the throne of Khan, becoming the new ruler of the Heshut Khanate and the last Great Khan of the Heshut Khanate.
At the beginning of his reign, he sent people to Beijing to pay tribute to the Kangxi Emperor, and formed a strategic alliance with the Qing Empire to jointly resist the expansion of the Dzungar Khanate. At the same time, the power structure within Tibet also underwent tremendous changes, and the local government of Tibet, Dipa (Tibetan king), Sangyel Gyatso, gradually rose to prominence, and used the Dzungar Khanate as foreign aid to restrain Razang Khan at every turn. In the forty-fourth year of Kangxi (1705), Sangjie Gyatso even bribed Lazang Khan's guards and prepared to poison Lazang Khan, but the plan was leaked and was learned by Lazang Khan, but it was unsuccessful. After the incident, Sangyel Gyatso simply raised troops to rebel, but the rabble in the hands of Sangyel Gyatso was the opponent of the brave and warlike Mongol cavalry under the command of Razang Khan, and Sangyel Gyatso's rebellion was quickly quelled by Razang Khan. Sangyel Gyatso himself was captured and taken to Lhasa to be executed.
Kangxi believed that Sangyel Gyatso colluded with the Dzungar Khanate and caused chaos on the frontier, Kangxi highly praised Lazang Khan's behavior in maintaining border security, and awarded Lazang Khan the title of "Yifa Gongshun Khan", and rewarded many materials needed in Tibet, and the relationship between the two sides became closer. At the same time, Sangyel Gyatso's men fled to the Dzungar Khanate, where they lobbied the Great Khan of the Dzungar Khanate to conspire with Alabutan to send troops and Shut.
Arabutan had long wanted to reach out to the Shute Khanate, and he also coveted Tibet. Therefore, Alabutan played the banner of "revenge" for Sangyel Gyatso and sent troops to Tibet. In the fifty-fifth year of the Kangxi reign (1716), the first general of the Dzungar Khanate, the first general of the Dzungar Khanate, Dace Ling Dun Dobu (this person is a world-class god of war who defeated the Tsarist Empire, the Qing Empire, and the Kazakh Khanate at the same time), led 6,000 elite Dzungar cavalry to attack the Heshute Khanate.
With these 6,000 cavalry, Dace Ling Dundob set out from Ili, crossed the glaciers of the Tianshan Mountains, Kunlun Mountains and other mountain ranges, lasted several months, rushed thousands of miles, and attacked the Heshute Khanate, defeating the army of the Heshute Khanate along the way, which was invincible. In the 56th year of Kangxi (1717), Dace Lingdun Dobu attacked Lhasa, and Lazang Khan had to lead his troops to retreat to the Potala Palace, and at the same time sent people to ask the Qing Empire for help. In the end, Razang Khan did not wait for reinforcements from the Qing Empire, and the Potala Palace was breached by the Dzungar army, and Razang Khan himself was captured by the Dzungar army.
After Lazang Khan was captured, the old tribes of Heshute in Tibet planned to rescue Lazang Khan, for this reason, Dace Ling Dun Dobu ordered the execution of Lazang Khan, and appointed Dazawa (Yizuo Dakwe) as a puppet Diba to manage Tibetan affairs, and the actual power was all in the hands of the Dzungar Khanate, so that the 75-year-old Heshute Khanate perished. The fall of the Heshut Khanate deprived the Qing Empire of an important ally, and more seriously, the Dzungar Khanate seized Tibet, creating a condescending and favorable situation on the western frontier of the Qing Empire. For this reason, in the 59th year of Kangxi (1720), the Kangxi Emperor sent the Qing army into Tibet and launched the battle of "driving the quasi-preservation", successfully expelling the Dzungar army from Tibet and incorporating Tibet into the territory of the Qing Empire.