In the article,it is introduced physicochemical properties of desulfurization ash and flue gas desulfurization gypsum,the by- products for flue gas desulfurization of sintering as well as current situations of technological development and comprehensive utilization for desulfurization ash and flue gas desulfurization gypsum at home and abroad. Moreover,the use patterns of by-products for desulfurization are put forward based on the actual situations.