The damage effects of compound reactive fragment on steel target were studied. Using Ф12.7 mm ballistic gun, the tests of compound reactive fragment penetrating A₃ steel target were carried out and recorded by a high speed camera. Results show that phenomenon of burning and explosion are obvious while reactive fragments penetrate target. The effect of deflagration produced by compound fragments with titanium powder and PTFE materials are better than that of fragments with aluminum powder and PTFE materials. The compound reactive fragment with thicker shell have a better penetrating effect on target. Comparing with the same dimension of inert steel fragment, the hole diameter of penetrating target is increased by about 40% for compound reactive fragment.