Abstract: Concrete design of steel tube filled concrete should not only meet the requirements of self-compacting, but also need the suitable expansion properties. On the basis of working performance requirement, the impacts of expansive agent on concrete working performance, strength and expansion properties are studied, the C60 steel tube filled concrete is prepareed to meet the self-compacting and expansion properties. When the dosage of expansive agent is 10%, concrete free expansion ratio reached 0.07%～0.09%, and restrained expansion ratio reached 0.02%～0.035%. Meanwhile, in consideration of working performance and strength of concrete, the expansive agent should not be too much. The research also found that restrained expansion ratio and free expansion ratio of expansive concrete have good correlation, but the correlation rule is affected by the expansive agent content.