Abstract: The ingot specimen was obtained by melting industrial pure iron in which TiN particle with 2.7 μm size was added.The existent state and chemical component of nonmetallic inclusions in the metal-phase sample were investigated with SEM and EDS.The characteristic of nonmetallic inclusions extracted from ingot by the electrolytic method in the nonaqueous solution, such as morphology, size and chemical component, were studied with SEM and EDS.Experimental results show that there were high Ti contain in inclusions.There were a lot of white punctate MnS inclusions at some surface of Ti inclusions.Some TiN particle combined automatically with the inclusion in the molten.At last, the thermodynamic stability of TiN particle in molten pure iron was analyzed.