The physical morphology and chemical composition of titanium gypsum was simulated with natural gypsum.The physical properties of natural gypsum, titanium gypsum and simulated titanium gypsum were comparatively studied.The natural gypsum were prepared that had the same specific surface area, average particle size and particle size distribution as those of titanium gypsum by controlling grinding time.The chemical compositions of natural gypsum and titanium gypsum were basically same by adding ferric hydroxide into natural gypsum.The main factors which affect the physical properties of titanium gypsum were found through a series of performance study.The results show that the specific surface area has a certain influence on the physical properties of titanium gypsum.The water for standard consistency of simulated titanium gypsum increases and the mechanical strength decreases with the increase of specific surface area.The amount of ferric hydroxide added has significant influence on the physical properties of titanium gypsum.The water content for standard consistency increases significantly and a sharp decrease of the mechanical strength occurs with increasing content of ferric hydroxide.