The influence of limestone powder with different mixed law(0%,5%,10%,15%,20%) on the workability and strength of concrete were studied. The results show concrete slump with limestone powder is smaller than the baseline group,but its cohesiveness and water retention are in good quality. The compressive strength of concrete shows a trend of first increase and then decrease with increasing of mixing amount of limestone powder,the concrete compressive strength is highest in each age(7 d、14 d、28 d) when limestone powder dosage is 10% than other groups.