This study examines the seed germination response of Sorbaria sorbifolia, Spiraea salicifolia and Potentilla fruticosa to heat shock and smoke in Daxing'an Mountains. Seeds were exposed to the dry heat shock treatment (60℃ 5 min, 60℃ 15 min, 90℃ 5 min, 110℃ 5 min and 150℃ 5 min), the wet heat shock treatment (60℃ 5 min, 60℃ 15 min and 95℃ 5 min) and the smoke treatment (5 min, 10 min and 20 min). The results showed that: (1) in response to the dry heat shock, the seed germination percentage of S. sorbifolia increased significantly when seeds were subjected to the treatment of 60℃ for 15 min (P<0.05) and decreased significantly relative to the control when subjected to 110℃, 150℃ for 5 min (P<0.05). For S. salicifolia, the seed germination percentage increased significantly and the seed mean germination time shortened significantly when subjected to the treatment (P<0.05). For P. fruticosa, the seed germination percentage decreased significantly relative to the control when subjected to 150℃ for 5 min (P<0.05). (2) In response to the wet heat shock, the seed germination of S. sorbifolia and S. salicifolia stopped after the treatment. For P. fruticosa, the seed germination stopped when subjected to 60℃ for 15 min and nearly stopped when subjected to 95℃ for 5 min. For P. fruticosa, the seed germination percentage decreased significantly and the seed mean germination time extended significantly relative to the control when subjected to 60℃ for 15 min (P<0.05). (3) In response to the smoke, the seed mean germination time of S. sorbifolia and P. fruticosa extended significantly after the treatment (P<0.05). For S. salicifolia, the seed germination percentage increased significantly and the mean germination time shortened significantly relative to the control (P<0.05).