南京軍区
In January 1999, Sun became Director of the Political Department of the Shenyang Military Region, and attained the rank of lieutenant general in 2000. He was transferred to the Nanjing Military Region in August 2003 and became Director of the Political Department there. In January 2005, he became vice political commissar and secretary of discipline commission of the Nanjing Military Region. From 2005, he served as Political Commissar of the PLA General Logistics Department. He was made a full general in June 2007.