Based oDthe observed data in l982-1985 at Shuidong Bay area, west Guangdong Province, the morphodynamic processes of tidal inlet and ebb-tidal deltainthe barrier-lagoon system are presented, including the dynamic features of tides and in the tidal inlet. the regional dyanmics and longshore sedimeot transport in the ebb-tidal delta, the genesis of the entrance bar, the recent erosion and deposition in the ebb-tidal delta and so on. The paper attempts to answer two questions, i. e., the stability of the tidal in let and the feasibility of dredging on the entrance bar for the course of Shuidong Harbour The reslts show that the stability of the tidal inlet is ideal and that dredging action on the entrance bar may be suc-cessful if dredging is deep enough and the course position reasonable