Abstract: The [Al]_S and T[O] content of 72A and the composition and photos of the inclusions during LFVD refining period in Capital Steel were systematically analyzed.The results show that the[Al]_S content increases sharply between the end of LF and beginning of VD,after VD most of the inclusions are in the high melting temperature area.It is concluded that the aluminum in alloy and Si-Ca wire feeding cause the increase of[Al]_S,the high CaO and low SiO₂ content are the main reason of inclusions being in high melting temperature.The improving measures are put forward which include reduction the Ca content of deoxidizes, cancel wire feeding and decrease the basicity of refining slag.