Abstract: Self stress in concrete can be produced by adding expansive agent, which has the effects of enhancing and crack resistance. The strength of cement paste is obviously improved by increasing dosage of steel fiber, but the strength decrease with increasing content of expansive agent. Steel fiber mixed with expansive agent is enhanced. Curing 3d has little composite enhanced influence, curing 28 days compound enhancement effect is obvious; and hook-type steel fiber has better effect than wave-type steel fiber. Under the condition of moderate inflation performance, the largest self-stress theoretical calculation value can reach 15MPa.