The research object of this paper is the water in the acid-soluble titanium slag, the main raw material for the production of chlorinated titanium dioxide. The conventional drying characteristics and influencing factors of acid-soluble titanium slag were investigated. By studying effects of temperature change, sample quality change, and initial water content change on the acid-soluble titanium slag, the water migration behavior during the drying process was obtained, thereby revealing the basic law of the acid-soluble titanium slag drying process, further proving the internal mass transfer mechanism of the titanium slag. Through experimental research and theoretical discussion, the study can provide the scientific basis for the industrial application and promotion of dry metallurgy and chemical raw materials.