Based on the sedimentary characteristics of a chenier built up mainly by big storms, found at Changwan Bay on the southern coast of South China，a model with an idealized sedimentary sequence is made for the evolution of a storm building up chenier. The stratum structures, granularity features, 14C ages, material composition and shell species’s ecological origin of the chenier as well as storm surge levels and earth movement of the study area have been analyzed. The study indicates that the storm deposits of the chenier can be well conserved because of being accumulated under big storm surges and therefore located above the mean high water level and beyond the actions of welfare weather waves. The sequence can be upwardly divided into 4 sectors with different sedimentary characteristics and profile features, representing the 4 phases from the beginning to the end of the chenier development. The 4 phases are (1) formation of a tidal flat with black silt; (2) storm deposition in a surf zone characterized by hummocky cross-stratifications with a tidal profile; (3) storm deposition under surge water represented by scour-and-fill structures with a swell profile; (4) swash deposition over surge water with no clear beddings. A storm building up chenier is different not only in the development processe but also in sedimentary structures, shell species and depositional locations and elevations from a no-storm origin chenier. Key words: chenier; storm surge; idealized sequence; development model