The soils which distributed in the belt of transition between sea and land are the coastal saline soils developed under the differentactions of coastal landform, river hydrology, tidal wave, climate vegetation and activity of man. According to their differences in soil formation factors and genrtic characteristics,they can be divided into four subgroups: mud solonchak, sandy solonchak, meadow solonchak and mangrove solonchak. Their common characteristics are (1) that soil layers are thick but textures are different: (2) that genetic horizons are not obvious and have the swamping characteristics; (3) that soil salt content is more higher and of obvious salinization; (4) that main clay minerals are illite and kaolinite; (5) that soil nutrients are more higher and the ranges of pH-value are great. At present, the main problems in the use of the coastal soils are low utilization ratio of the soils, and unreasonable utilization of the soils resalting in distraction of mangrove resources. According the acture sctuation, some measues for reasonable use of the soils are recommcended.