The excavated-in harbors in China are mainly Tangshan port Jingtanggang area, Caofeidian harbor area, and Dandong port Dadonggang area. Based on the analysis of arrangements of typical excavated-in harbor basins of China, we consider that under the situation that there is a large-area applicable lowland w ithin the coast line, we may build the excavated-in harbor, which can effectively solve the problems concerning the use of coastline, basin’s earthwork balance and back silting, etc. In addition, the width of the excavated harbor basin shall be narrowed to the greatest extent under the prerequisite of guaranteeing the safe maneuvering of ships so as to reduce siltation in the basin.