Thinley Namgyal, 32, died soon after he set himself alight in Kardze prefecture in Sichuan province yesterday, according to British-based advocacy group Free Tibet and the US-funded Radio Free Asia (RFA).
Namgyal, the youngest son of a semi-nomadic farming family, self-immolated "in protest against Chinese policy and rule" in Tibetan areas, RFA reported, citing a local resident.
It added that mobile phone service and other communication lines to Tawu county, where the incident took place, had since been cut off.
The latest incident follows the self-immolation last month of a Tibetan nun who set herself alight while performing a prayer ritual at a monastery in Kardze prefecture.
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Free Tibet director Eleanor Byrne-Rosengren said in a statement that the self-immolations happen because China "continues to use force to deny them their basic human rights and their fundamental right to determine their own future as a nation".
Beijing accuses the Dalai Lama, the Tibetan spiritual leader-in-exile, of encouraging self-immolations to further a separatist agenda.
The Dalai Lama, a Nobel Peace laureate who lives in India, has described the self-immolations as acts of desperation that he is powerless to stop.
Rights groups call the protests a reaction to Beijing's tight control over Tibetans' rights, including the exercise of religion.