國民政府軍事委員會
On 7 February 1928, Li was made a member of the standing committee of the Military Affairs Commission. He was also made commander in chief of the newly established Eighth Route Army. On 1 March, Li became chairman of the Guangdong branch of the Political Council of the Kuomintang, and on 30 March he was made chief of the general staff of the Northern Expedition. During the remainder of the year, Li attended meetings in Beijing, and briefly served as acting commander in chief of the Nationalist forces when Chiang Kai-shek left Beijing for Nanjing. He was appointed to the State Council on 8 October and resigned as Governor of Guangdong in November.