Silicate based phosphors for white LED have many advantages, such as abundant raw materials, low cost, simple synthesis process, composition diversity, adjustable luminescence, and so on. And it is extensively investigated in recent years. Fluxes play an important role in the preparation of silicate phosphor. This paper introduces the use of fluxes in silicate phosphor system. The type and amount of fluxes have some influence on the crystal phase, luminous intensity and morphology of phosphor. The results show that adding different fluxes and the different amount of fluxes can make silicate phosphors form different types of crystal phase. The fluxes cation around the activator ions causes the number of luminescence centers to change, which can change the shape of the emission spectrum and greatly improve the luminous intensity, but excessive fluxes will reduce the luminous intensity of the phosphors. The effect of flux on the surface morphology of phosphor is obvious. Appropriate flux can refine the grain, make the grain size uniform and spheroidize, but excessive flux will make the sample agglomerate. The key on the synthesis of high performance phosphors is to strengthen the study on the mechanism of flux in the preparation of phosphors, and to select the appropriate flux and its dosage.