In October 1950 Jigme surrendered Chamdo to the invading Chinese People's Liberation Army. He headed the Tibetan delegation to the Beijing peace negotiations in 1951, where he signed the Seventeen Point Agreement with the Chinese Communist government in 1951, surrendering Tibet's sovereignty in exchange for guarantees of autonomy and religious freedom. His signature of the Agreement was obtained under tough negotiating conditions and is believed by many authorities to be invalid, because it exceeded his powers of representation as governor of Chamdo province. The Dalai Lama claims this agreement was never ratified by legitimate Tibetan authorities. In 1952, the Tibetan Prime Minister Lukhangwa told Chinese Representative Zhang Jingwu that the Tibetan "people did not accept the agreement. In 1959, the Dalai Lama on his arrival in India after he fled Tibet repudiated the "17-point Agreement" as having been "thrust upon Tibetan Government and people by the threat of arms".
After 1951, Jigme's career continued within the ranks of Chinese Communist administration of Tibet. He served as the leader of the Liberation Committee of Qamdo Prefecture until 1959. He was also a member of the State Council's minority commission and CPPCC between 1951-1954. Deputy commander of the Tibet Military Region between 1952-1977 and member of National Defence Council 1954 through the Cultural Revolution. Appointed lieutenant general and awarded "Order of Liberation" first class 1955. He represented Tibet in seven National People's Congress under the standing committee from the 1st National People's Congress in 1954 to the 7th in 1988. He was an honorary president of the Buddhist association since 1980. Head of the NPC delegations to Colombia, Guyana, West Indies, Sri Lanka and Nepal in the early 1980s.
Among other functions, he was vice chairman of the Standing Committee of the National People's Congress (NPC) of the People's Republic of China for many years. He was the third Tibetan in this position, following the 14th Dalai Lama and the 10th Panchen Lama.
Jigme was also elected president of the "Association for the Protection and Development of Tibetan Culture", which was established on June 21, 2004.