Abstract: In recent years,natural gypsum supply falls short of demand,price soars rapidly,its very large proportion is used to do set retarder of the cement.In order to solve this problem,the paper starts from the gypsum retardant mechanism of set retarder,to analysis and study the titanium white residue chemical component in the process byproduct of titanium white powder,the function compare experiments in cement with the natural gypsum,the best addition,etc.the conclusions are that titanium white residue can act as the natural gypsum to make set retarder in cement,and its the optimization addition is 5%～ 6%,etc,the paper explore the new road for synthesize utilizing the resources and choosing set retarder of cement enterprises.