In this study, the phenomenon and reason of spring tide accompanied high waves induced sea dike inundation and erosion in the West of Ca Mau province on August 2–3, 2019 is analyzed based on observation data at the marine weather station of Phu Quoc and Tho Chu, the hydrological station of Song Doc and the re–analysis data of wind and wave from ECMWF, the surge from HYCOM. In which, the Tho Chu and Phu Quoc stations are the only two marine weather stations in the Southwestern Sea area, the Song Doc hydrological station located about 1.5 km from the coastline can record the water rising from the sea. The results show that, the Song Doc station has recorded abnormally surge in the evening of August 02–03, 2019, caused by rising water from the sea. In the west coast of Ca Mau, high tide occurs simultaneously with surge and high wave due to strong wind, in which the swell is significant contribution to the total water level. The reason of surge with high waves in the study area is due to the strong the southwest monsoon, which persists for a long time in the area, most notably the strong wind in the northwest and southern areas of Cape Ca Mau, which has caused high swell. The results of the study are meaningful in monitoring, forecasting and warning of the spring tides and high waves in the area.