Samding Dorje Phagmo Buchu Monastery, Buchu Sergyi Lhakhang, or Buchasergyi Lakang Monastery (Tibetan: བུ་ཆུ་གཟི་བྱིན་ལྷ་ཁང, Wylie: bu-chu gzi-byin lha-khang) is a temple in an ancient monastery about 28 km south of the modern town of Bayi, which replaces the old village of Drakchi, in Nyingchi County of eastern Tibet, China.
The lower part of the large Padmasambhava downstairs survived, and still contains the zungjuk or mantra-core.
[3] The original buildings here were built during the 7th century reign of King Songtsen Gampo.
It was created as one of the eight "demoness-subduing" temples, and was constructed according to geomantic theory on the right elbow of the ogress who represented Tibet.
It originally belonged to the Nyingmapa, but by the 17th century there were Gelugpa present here, and it formally adopted by them during the time of the Regent, Demo Rinpoche (r.1886-1895).