Abstract: In the exploitation of geothermal resources,single-well heat extraction technology can realize geothermal development without taking water,which has a wide application prospect. The single-well heat extraction relies on heat conduction between wellbore and reservoir,heat convection between wellbore and reservoir water. Therefore,the thermal resistance between wellbore and formation is an important factor affecting efficiency of heat extraction. Employing cement with thermal conductive materials in the thermal recovery section of geothermal reservoir is an effective method to enhance heat extraction efficiency. The study puts forward a method of preparing thermal conductive cement with oil well cement and thermal conductive materials. Then thermal conductivity and compressive strength tests were carried out,and the influence of thermal conductive material content exerted on the thermal conductivity of cement paste was studied. Moreover,relations between porosity and cement paste thermal conductivity,and relations between particle continuity and cement paste thermal conductivity was studied by using SEM scanning and porosity test. The research demonstrates that with the content of thermal conductive material increasing,the thermal conductivity of cement paste increased firstly and then decreased;As the temperature rises,the thermal conductivity of cement paste decreased gradually;The higher the porosity of cement paste is,the lower the thermal conductivity of cement stone is;The worse particles continuity is,the lower the thermal conductivity of cement stone is;Cement paste with 0.05-0.15 thermal conductive material can improve thermal conductivity of cement paste. The results of this study provide theoretical guidance for improving the thermal conductivity of cement in geothermal well.