In order to reduce pollutants and CO2 emissions, increasing the application ratio of pellets in BF has become the development tendency. With the ratio increasing, it's necessary to increase the basicity to compensate for the lack of slag basicity in BF. In this paper, six calcium flux, limestone powder, lime, hydrated lime, dolomite, lightly burned dolomite and carbide slag, was studied, by analysis the physical and chemical properties, including microstructure, thermal properties, and ballability, providing a scientific basis for optimization the flux. According to the study, hydrated lime has better property and decreases the amount of bentonite consumption to obtain the pellets with low silica. The new producing technologies of self-fluxed pellets with hydrated lime were applied on the indurating machine. The low-silica self-fluxed pellets with basicity 1.10, SiO2 content 2.2%, and reduction swelling index 16.5% were successfully used by 55% rate in the 5500m3 BF in Shougang Jingtang.