Abstract: Based on the historical studies and combined with statistics,harmonic analysis,means low-pass filteringand spectal analysis,the characteristics of the tides and residual cuments were analyze with data of more than 3months fom Quanzhou Bay waterwayM station.The result shows that the tidesat the station is regular semidiurnaltide,with a predominantsemidiurnal component M₂.The dominant direction of all rising tide layers are of WNWdirectiom,and the domimant direction of surface ebbing layers are of SE—ESE direction,with the measured riseand ebb maximum flow rates upto 151 cm/s and 138 cm/s,respectively.The estuarine circulation dynamicprocess and vertical circulation is rather clear and evident at the station.From the suface to the bottom,the residu-al stream flows clockwise fom WSW to NW.The tension of water body increases with the mles of ebb tides and sa-limity layer structure that decreases gradually with the flood tide.