Since 1728 he served as the Grand Secretary of the Wuying Hall (武英殿大學士) and awarded the honorary minister of Personnel.
In 1730, Marsai, Zhang Tingyu and Jiang Tingxi were appointed Grand Councillors to participate in discussions on the war against the Dzungar Khanate.
After the defeat of the Qing army in Battle of Khoton Lake in the next year, Marsai replaced Furdan (傅爾丹) as the Border-Pacification General-in-Chief (撫遠大將軍) to lead a military campaign in northwestern China against the Dzungar Khanate.
[3] Marsai was made commander of the garrisons at Jak (扎克) and Baidarik (拜達里克) to guard the route from Guihuacheng (歸化城) to Chakan Sor (察罕叟爾).
[4] In 1733 Marsai, for his failure in the previous year to attack the fleeing enemies who were defeated and pursued by Prince Tsereng (策棱), was executed after a court martial.