Required by the supercritical carbon dioxide(sCO2)coal-fired power cycle,sCO2 entering a boiler has a high temperature and can cause overheating of tubes.To eliminate the pressure drop penalty effect,the sCO2 boiler consists of several modules,each having different heat flux received from the furnace side(q)and different CO2 temperature in the cooling wall tube(Tf).We aim to search for the best matching strategy coupling furnace side and tube side to obtain the lowest temperature of tubes.By theoretically analyzing the wall temperature influenced by q,Tf and a comprehensive thermal resistance C,two matching methods are introduced:the heat flux-temperature matching(HTM)which matches higher q with lower Tf,and the heat flux-heat flux matching(HHM)that matches higher q with higher allowable-heat-flux at the temperature limit of tubes.HTM is a conventional method but HHM is newly proposed here.We show that,if C is identical for different modules,the two methods coincide;otherwise,HHM is recommended.For a sCO2 boiler driving 1000 MWe power plant,smaller cooling wall temperatures are obtained by HHM than HTM.Based on HHM,the mid-partition wall,heat transfer enhancement,and downward flow are comprehensively used,decreasing the wall temperature significantly.