Abstract: In order to find out the noble gas content, element geochemistry and mineralogy of potential helium source rocks(hot dry rocks)in Gonghe Basin, the granites associated with hot and dry rocks in Gonghe Basin were collected for rare gas and radioactive uranium-thorium testing, scanning electron microscopy and energy spectrum analysis.The results show that the helium content in the granite is 49×10^-6~851×10^-6, and the helium content per ton of rock is 0.27798~4.76992 m³.The helium content in local section is higher.The isotope values of ³He/⁴He are in the range of 7.30×10^-10~2.5×10^-8, which indicates that the helium in this area is of radioactive origin.Independent and dispersed minerals of uranium and thorium are commonly found in granite bodies in the Gonghe Basin, with uranium content ranging from 0.74×10^-6 to 38.1×10^-6, with thorium content ranging from 4.7×10^-6 to 42.2×10^-6.Estimated helium generation in the study area is approximately 269×10⁸ m³.On this basis, further research was conducted on the reservoir characteristics of granite helium gas reservoirs.There are sections with low density, high porosity, and microcrack development in the rock mass.Logging data also shows that the storage characteristics and brittleness of the granite rock mass are good, which is the space for helium gas occurrence.The sealing temperature of uranium rich minerals in granite for helium gas(27~250℃) is basically the same as that of granite related to dry hot rocks(80~236℃), which meets the sealing conditions.It is estimated that the sealed helium amount in the rock mass is 4.03×10⁸~46.8×10⁸ m³.Helium content is present in the shallow and deep parts of the rock mass, as well as in the fracturing flowback fluid.High helium content is present in the deep part, and helium accumulation is evident in the flowback fluid after fracturing, which preliminarily proves the existence of self-generated and self-preserved helium gas accumulations.