He is freed a month after his sentence ends on his family's assurance they will not publicize the release.
Many had received advanced degrees in India, and returned to Tibetan areas to teach in local monasteries.
Monks and nuns coming from Larung Gar's Serthar county may now also be forced to leave, sources say.
Following his friends' release from prison, he is seized by police after returning to his home.
They had released a CD of songs praising the Dalai Lama and opposing Chinese rule in Tibetan areas.
They go door-to-door checking monks' and nuns' personal information and selecting individuals for removal.
They are told they may be able to continue their studies if they leave on their own
Police monitor proceedings at the once-restive Tibetan monastery but do not interfere, a local source says.
His sister, a mother of four, had burned herself to death to protest China's 'violent rule' in Tibetan areas.
Taken into custody by Chinese police in June, he has not been heard from since.
He follows writer Gangkye Drubpa Kyab into detention after a public display of respect to the Dalai Lama.
Gangkye Drubpa Kyab is taken into custody after attending a reception welcoming his early release from prison.
Tibetans attending the Northwest University of Nationalities in China's Gansu see themselves marginalized by new policies.
They were convicted of sending information and images of a Tibetan mother's protest to outside contacts.
Monks and nuns from Qinghai, Gansu, and Yunnan provinces are told to leave the huge religious study complex.
He is freed without explanation after serving more than four years for criticizing Beijing's rule in Tibetan areas.
Usually held only by monks, the event draws hundreds of nuns from seven convents in Sichuan and Qinghai.