After the overthrowal of the Republic of China by the Communists in 1949, and the establishment of the People's Republic of China, the People's Liberation Army entered Eastern Tibet in 1950, and extended Chinese control over all of Tibet during the next few years. A Tibetan governement existed until March 1959, when it was disolved following a failed uprising. On 9th September 1965 Tibet became an Autonomous Region of the People's Republic of China.
Since the annexation of Tibet by China, there have been no issues of postage stamps specifically for use within Tibet. However, the Chinese People's Postal Service has issued several sets of commemorative stamps relating to Tibet, and Tibetan scenes are shown in some ordinary stamps.
Set Number : Ji 13
Issued : 10.01.1955
Values : 400 fen, 800 fen, 800 fen, 1000 fen
Chinese Title : 和平解放西藏
Tibetan Title : ༄༅༎བོད་ཞི་བས་བཅིངས་བཀྲོལ་།
Set Number : J.116
Issued : 30.03.1956
Values : 4 fen, 8 fen, 8 fen
Chinese Title : 康藏、青藏公路
Set Number : J.116
Issued : 01.09.1985
Values : 8 fen, 10 fen, 20 fen
Chinese Title : 西藏自治区成立二十周年
Tibetan Title : བོད་རང་སྐྱོང་ལྗོངས་དབུ་བརྙེས་ནས་ལོ་ཉི་ཤུ་འགོར་བ།
Set Title : Chinese Folk Dance Set 1 [中国民间舞蹈(第一组)]
Set Number : Te 49 (Stamp 4 of 6)
Issued : 1962
Value : 20 fen
Set Title : Famous Chinese Landmarks
Set Number : Ord.21
Issued : 15.01.1983
Value : 70 fen
Chinese Title : 珠穆朗玛峰 [Mount Qomolangma]

Set Title : Chinese Folk Dwellings
Set Number : Ord.23
Issued : 1986
Value : 1½ fen
Chinese Title : 西藏民居 [Tibetan Folk Dwellings]

Set Title : 50th Anniversary of the Establishment of the PRC : The Nationalities United [民族大团结]
Set Number : 1999-11 (Stamp 4 of 56)
Issued : 1999
Value : 80 fen
Chinese Title : 藏族 [Tibetan Nationality]