Knowing　and　promoting　the　strength　development　of　concrete　at　an　earlier　age　is　essential　for　accelerating　formwork　circulation　of　the　on-site　construction　and　precast　product　manufacture.　The　strength　development　rate　at　earlier　ages　of　less　than　the　initial　24　h　was　investigated.　The　effect　of　measures　of　adding　silica　fume,　calcium　sulfoaluminate　cement,　and　early　strength　agent　on　the　strength　development　of　earlier　concrete　at　ambient　temperatures　of　10,　15,　20,　25,　and　30　&　DEG;C　was　studied.　The　microstructure　and　long-term　properties　were　further　tested.　It　is　shown　that　the　strength　increases　exponentially　first　and　then　logarithmically,　different　from　what　is　commonly　recognized.　Increasing　cement　content　exhibited　a　certain　effect　only　above　25　&　DEG;C.　When　the　cement　content　increased　from　420　to　460　kg/m(3),　the　strength　only　increased　from　6.2　to　6.7　MPa　after　12　h　at　25　&　DEG;C.　The　early　strength　agent　could　increase　the　strength　significantly,　the　strength　could　be　increased　from　6.4　to　10.8　MPa　after　20　h　at　10　&　DEG;C　and　from　7.2　to　20.6　MPa　after　14　h　at　20　&　DEG;C.　All　measures　for　promoting　earlier　strength　did　not　have　an　evident　negative　effect.　The　results　could　be　potentially　referred　for　the　formwork　removal　at　a　suitable　moment.