Taking　the　granite　residual　soil　of　Fujian　Province　as　an　example,　this　paper　investigated　the　humidity　migration　law　of　the　granite　residual　soil　pillar　embankment　under　the　co-influence　of　temperature　and　capillary　based　on　the　finite　difference　technology.　The　results　show　that　the　temperature　and　humidity　of　the　surface　of　the　soil　pillar　take　on　the　linear　downward　trend　under　different　temperature　gradients,　and　the　larger　the　temperature　gradient　is,　the　wider　the　falling　range　will　be.　The　temperature　and　humidity　migration　volume　of　the　hot　end　of　the　soil　pillar　presents　the　linear　variation　along　with　the　increase　of　the　average　temperature.　The　change　of　the　temperature　field　of　the　residual　soil　pillar　is　mainly　influenced　by　the　temperature　gradient.　The　humidity　migration　volume　and　the　rising　height　of　the　capillary　water　are　obviously　more　strongly　influenced　by　the　average　temperature　than　the　temperature　gradient.　Therefore,　it　is　necessary　to　study　the　influence　of　the　temperature-humidity　coupling　on　humidity　migration　for　the　low　embankment　of　the　high　underground　water　level　in　the　hot-humid　area.