The distribution characteristics of the heat flow in Yunnan have been expounded,the vertical distribution of the heat production for the crust and upper mantle has been discussed from the crustal structure,and the structure of deep heat flow in Yunnan has further been studied.The studies indicate that the heat flow from the upper crust is greatest vertically, greater from the middle crust and smallest from the lower crust,and quite large differences exist laterally in the structure of deep heat flow among various tectonic units.The range of mantle heat flow is from 19 to 57 mW/m² in whole Yunnan region.