Abstract: Impinging jets widely exist in many engineering fields,such as a short takeoff ver-tical landing (S/VTOL),as well as rocket lunching.It’s important to know the shock wave structure of impinging jets.In a simple rainbow schlieren system,the knife edge in the cut-off plane is replaced by a tricolor filter with a background color center and two colors separated by central band.The direction of the filter can usually be adjusted so that the density gradients in different direction can be examined.The rainbow schlieren apparatus requires no laser source, the optical alignment is simple,and it is tolerant to minor mechanical imperfections and/or vibra-tions.In this paper,the rainbow schlieren method is used in impinging jets experiments at differ-ent range and pressure ratio.Some perfect experimental results are gotten.Three kinds of impin-ging j ets are discussed and found that the size and shape of mach disk are depended on the pres-sure ratio.The result shows that when the distance between nozzle and ground plate is relatively large,the structure of impinging jet is similar to free jet,and the jet district near the ground plate is weakly.As the distance become closer,the jet region near the ground plate becomes stronger and a big stagnation bubble appears in the recirculation flow region at a particular pres-sure ratio.