The study area located in Easter Shandong area, which belongs to the northern part of the north Shandong uplift. Methods:In this paper, the thermal conductivity and heat generation rate of rock are measured by testing 40 typical core samples.Combined with temperature measurement data and collected data,the composition of geothermal flux in this area was analyzed and studied.Typical geothermal fluid samples in the area were collected to obtain hydrochemistry data.Results:The measured rock conductivity in this area is from 2.8 to 5.7W/（m·K）,which is generally higher than the average thermal conductivity of the upper crust.The geothermal gradient is 31.8alyz.The geothermal flux calculated by thermal conductivity and geothermal gradient is 102 mW/m2,in which the heat conduction component is 73.2±6.18 mW/m2 and the convection component is 28.76±8.76 mW/m2.The ratio of crustal heat flow to mantle heat flow is 1∶1.98～1∶2.52.The calculated average reservoir temperature by quartz thermometer is about 128.6 ℃ and the thermal cycle depth is about 3634m.Conclusions:The geothermal flux in Zhao yuan geothermal field is contributed by both conduction heat and convection heat.The contribution of crustal heat flow is half of mantle heat flow,and the thermal structure of lithosphere belongs to the “hot mantle cold crust” type.The research results enrich the geothermal system theory in this area and provide some theoretical support for the development and utilization of geothermal resources in this area.