HilbertHuang Transform and its end issue and orthogonality were introduced to analyze the characteristic of waves in surf zone and groundwater level in beach through typhoon by HHT. The results show that waveenergy in surf zone augments and transfers to low frequency during typhoon

weakens and transfers to high frequency after typhoon.Tthe oscillation of the groundwater level in beach is influenced by tidal and its period may be influenced by typhoon; coupling of chronometer high tide and typhoon result in singularity of groundwater oscillation.