To investigate the shock impingement on vertical injection in supersonic flow, shock was produced by a 9mm long, 23° angle wedge. The images of shocks impinged at different position and pressure of gas and liquid injection were achieved by using both a high speed camera and a schlieren system. Results revealed that gas and liquid injection almost have similar phenomena, that is, impinged by the shock, fuel turbulent intensity will increase, fuel distribution area will be larger in supersonic flow, spreading more quickly into the main supersonic flow, and the shock impinged at the foreside affect more than rearward of injection.