b case of using the converter slag as iron source of cement. it a investigated that thc addition of converter slag effects on the burnability prapertles of mixed materials, the clinkerization and the physical prapertles of cement. As a res~tlt of adhtian ol wnverter slag. the amount of quartz is increased, but the amount of day is decreased. The contcnt of C,S and C,AF is increased, bul that of C.S and C,A is decreased. Mn,O, of the converter slag has a role of rmncralize~ and improve the burnability and dinkcrizatiun. Same of the Mn,O, ex~sl in the intermediate compounds and in the calcium silicate. In case of using the converter slag as the raw material af the cement, it is effective of the cost of the raw matenals, the energy and the conteet of alkali in the clinker