Abstract: XRFS was applied to the rapid determination of 8 main components i.e.TFe,SiO2,MgO,Al2O3,CaO,MnO,TiO2 and P2O5 in slags of open-hearth furnace.The grainity effect was eliminated by pulverization of the sample to pass sample sieve with 53 μm in its hole diameter,and by pressing the powdered sample directly into round sample piece with 32 mm in diameter.The matrix effect was corrected by the α-coefficient method.Calibration curve was prepared by a set of standard samples.RSD′s of analytical sults of the 8 components were found in the range of 0.23% to 3.17%,which were satisfactory for routine control analysis.