The granulated blast furnace slag can be used to replace partial sand(extra fine sand) to prepare concrete. The influence of different rates of slag replacing partial sand on the properties of concrete is studied. The results show that the fluidity of concrete containing granulated blast furnace slag decreases with the increase of slag replacement rates. With the increase of slag replacement rates,the compressive strength of concrete increases at first and then decreases,optimal levels of granulated blast furnace slag replacement rates is 60%. The granulated blast furnace as fine aggregate has positive effect on the later strength of concrete. Meanwhile,based on the test results,the formula to predict the compressive of granulated blast slag as fine aggregate concrete is proposed.