There occurred several eruptions from Changbaishan Tianchi volcano in Holocene,and at least three of them were believed to be true according to the formal studies.The products of three eruptions were yellow comenditic pumice of～5000a B.P.(Eruption I),gray comenditic pumice and pyroclastic flow of～1000a B.P.(Eruption II,i.e.the millennium explosive eruption),black trachy pumice and welded tuff of～300a B.P.(Eruption Ⅲ)respectively.There were a large number of melt inclusions found in phenocrysts,which differ in size and color.The Leitz 1350 heating stage experiments for melt inclusions in host feldspars from three Holocene eruptions of Changbaishan Tianchi volcano imply that there were little differences between the homogenization temperatures of melt inclusions from Eruptions Ⅰ and Ⅲ,whereas it was rather complicated for Eruption II,i.e.there might be two kinds of melt with different homogenization temperature periods,which gave the evidence for the assumption that the explosive millennium eruption of Tianchi volcano was triggered by injection and mixing of two different magmas.The experimental results also indicate that(1)small melt inclusion is easy to be homogenized,while the large one,especially the one with lots of daughter crystals,is rather difficult to be homogenized;(2)homogenization temperature closely correlates with the size of melt inclusion within host crystal,with the temperature point switching from high heating rate to low heating rate,and correlates with whether it is the first time to obtain homogenization as well;and(3)a melt inclusion can get different homogenization temperatures when it is repeatedly heated.Even more,the next homogenization temperature is usually higher than the former one,which testifies the phenomenon that hydrogen migration occurs during repeated heating. There were several eruptions from Changbaishan Tianchi volcano in Holocene, and at least three of them were believed to be true according to the formal studies. The products of three eruptions were yellow comenditic pumice of ~ 5000a BP (Eruption I), gray comenditic pumice and pyroclastic flow of ~ 1000a BP (Eruption II, iethe millennium explosive eruption), black trachy pumice and welded tuff of ~ 300a BP (Eruption III) respectively. Here are a large number of melt inclusions found in phenocrysts, which differ in size and color. The Leitz 1350 heating stage experiments for melt inclusions in host feldspars from three Holocene eruptions of Changbaishan Tianchi volcano imply that there were little differences between the homogenization temperatures of melt inclusions from Eruptions I and III, but it was rather complicated for Eruption II, iethere might be two kinds of melt with different homogenization temperature periods, which gave the evidence for the assumption that the explo sive millennium eruption of Tianchi volcano was triggered by injection and mixing of two different magmas. The experimental results also indicate that (1) small melt inclusion is easy to be homogenized, while the large one, especially the one with lots of daughter crystals, is (2) homogenization temperature closely correlates with the size of melt inclusion within host crystal, with the temperature point switching from high heating rate to low heating rate, and correlates with whether it is the first time to obtain homogenization as well; and (3) a melt inclusion can get different homogenization temperatures when it is repeatedly heated. Even more, the next homogenization temperature is usually higher than the former one, which testifies the phenomenon that hydrogen migration occurs during repeated heating.