The　coupling　effect　of　moisture　content　and　temperature　on　the　elastic　modulus　of　concrete　is　experimentally　investigated.　The　elastic　modulus　of　dry　concrete　exhibits　a　clear　temperature-weakening　effect,　while　the　elastic　modulus　of　wet　concrete　exhibits　a　water-strengthening　effect　at　room　temperature.　Under　humidity-heat　conditions,　the　elastic　modulus　of　wet　concrete　declines　with　the　temperature　rise.　When　the　temperature　is　20　&　DEG;C,　200　&　DEG;C,　400　&　DEG;C,　520　&　DEG;C,　and　620　&　DEG;C,　the　humidity-heat　coupling　factors　of　the　elastic　modulus　change　rate　DIF　with　moisture　content　are　0.08,　0.07,　0.04,　0.01,　and　-0.03,　respectively,　and　the　declining　rate　increases　with　the　rise　of　moisture　content.　The　relation　between　the　humidity-heat　coupling　factor　DIF,　moisture　content,　and　temperature　was　established;　The　equivalent　relation　between　the　water-strengthening　effect　and　the　temperature-weakening　effect　of　the　elastic　modulus　was　obtained.　The　temperature　range　of　the　strengthening　effect　and　＂apparent　weakening　effect＂　of　water　stored　inside　concrete　before　heating　on　elastic　modulus　was　determined;　The　evolutionary　mechanism　of　the　competition　between　the　microcrack　expansion　and　healing　of　concrete　under　combined　humidity　and　heat　conditions　was　revealed.