Abstract: Described here in the article is the design of the technology for producing ferric oxide and reussin by means of using waste iron slag as main raw material to react with industrial sulfuric acid to get the former and using the resulted filtered solution together with caustic soda to get the latter. The said technology is helpful to solve the problems of land occupation and environment pollution caused by iron slag disposal, it itself features such advantages as small investment and land occupation as well as poison-free and harmless waste solution. Considerable economic and social benefits shall be obtained by applying the said products for industrial purpose.