Abstract: The model of water-stone flow impact test is established in laboratory to explore the impact characteristics of water-stone flow, with considering 6-stage solid-liquid ratios (0.01, 0.05, 0.10, 0.15, 0.20, 0.25) and 5 particle grading conditions (A-E). The spectrum and energy spectrum of impact acceleration signal are extracted based on the wavelet analysis method. The results show that, when τ=0, the auto correlation curve of the impact signal has a maximum value, but the curves on both sides are not periodic, indicating that the periodicity of the signal is poor. The two impulse signals are stable and highly correlated. The maximum energy of shock signal is in a₈ band.The maximum amplitude of each frequency band gradually decays from low frequency (a₈: 0~0.390 5 Hz) to high frequency(d₅: 3.125~6.250 Hz).The real impact acceleration signal of water-stone flow is in the band of 0~6.250 Hz, and the rest are noise signals. The research provides a new method for studying the impact characteristics of water-stone flow, and some references for the design of water rock flow disaster prevention structure.