In this paper，the electrolytic manganese residue is calcined and mixed with cement to prepare cementitious materials，the compressive strength and hydration product composition of cementitious materials at different ages are analyzed，the chemical morphology and leaching mass concentration of heavy metals are determined by BCR sequential extraction method and horizontal oscillation method，and the migration and solidification mechanism of manganese during hydration is discussed in detail. The test results show that the Mn in the electrolytic manganese residue is mainly in the acid-soluble state，and the acid-soluble Mn part is converted into a reducible state after calcination at a lower temperature ( 800 ℃ ) ，and the acid-soluble Mn is transformed into a residue state of Mn after calcination at a high temperature ( 1 100 ℃ ) . During hydration，the acid-soluble Mn is converted to hydroxide and dehydrated and oxidized to a reducible state. The results of leaching toxicity analysis show that the calcination and hydration process could effectively solidify heavy metals and remove ammonia nitrogen，and the concentration of heavy metals in the cementitious materials prepared by calcining and electrolyzing manganese residue at 1 100 ℃ meets the national standards and meets the environmental safety requirements of building materials.