Lang County is under Nyingchi City of Tibet Autonomous Region. It is located in the southwest of Nyingchi City, covering an area of 4,200 square kilometers. The China-India border is 100 kilometers long. Jurisdiction 3 township 3 towns, 52 administrative villages, 1 neighborhood committee (Langba Neighborhood Committee). The county is 420 kilometers from Lhasa and 240 kilometers from Bayi District, the seat of Nyingchi Municipal Government. According to the seventh census, as of midnight on November 1, 2020, the permanent population of Lang County was 17,648.

Famous specialty products are many kinds of animal products, pepper, fritillaria, five spirit fat, grapes, apples, walnuts and Tibetan caps, wooden bowls, etc. Within the territory of the Zahidaba Mountain for the Buddhist holy mountain. The hometown of the 13th Dalai Lama Tuteng Gyatso and the Ninth Panchen Lama Quji Nyima is in Lang County.

In 2018, the GDP of Lang County reached 741 million yuan, with a year-on-year growth of 14%; The total investment in fixed assets reached 2.772 billion yuan, up 20.5% year on year; Fiscal revenue reached 70.14 million yuan, up 10 percent year on year. Investment attraction reached 551 million yuan, up 133.16% year on year; The per capita disposable income of rural residents reached 15,433 yuan, up 13.9 percent year on year. Cash income reached 10,649 yuan, up 10 percent year on year.
On February 6, 2019, the People's Government of Tibet Autonomous Region decided to withdraw Lang County from poverty.