It is shown that in the homogeneous process of melt inclusions produced by explo sive eruption of the Tianchi volcano in the Changbai Mountains the phase changes of a certain type are often concentrated in a specific temperature interval. There are 2 temperature intervals, that is, 875~975 ℃ and 1025~1125 ℃, for the gasrich b ubble s to be minimized. It is generally easier for a smaller inclusion to be homogeni zed at a relatively lower temperature. On the other hand, the larger inclusions must be heated to a much higher temperature for them to be homogenized.