Abstract: Structure of blast furnace slag with 15% TiO₂ at Pangang is different from the normal blast furnace slag.Based on experiments on the property of Ti-bearing slag and its application in the concrete,it is concluded that the structure of high-Ti blast furnace slag is stable and compressive strength and breakage strength are higher than the latter, as compared with normal crushed stone used for concrete aggregate.Otherwise,the stability of it had been proved by the example of application.Development and utilization of the blast furnace slag are very important for the environmental protection and increasing slag yard lifetime at Pangang.