The relationship between mangrove zone on tidal flats and tidal levels is one of theimportant subjects of mangrove ecology, but up to now there have not been clear and commonopinion of it. Levelling survey was made on the 10 sections of mangrove tidal flats at threecoastal sites. Linshicun of Dongzhaigang Harbor in Hainan Island, Nasaicun of ChebanzhenTown In Lianjiang County of the west Guangdong, and" Splendid China" of Shenzhen city.Based on the data from the survey, the tide observation and tidal data a...