Abstract: In this article,through the analysing information of δ¹⁸O、δD、 ³H from the different aquifers and seepage water from coal roof in Huafeng Coal Mine,the conclusion can be drawn: up and lower sections of conglomerate aquifer of the Tertiary system are not hydaulic connection, they have different origins,the seepage water from the 4th coal roof is not the injecttion water but sandstone water.