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This paper focuses on identifying changes of the tidal level in the Pearl River estuary, China.Linear regression analysis and Mann-Kendall rank correlation test methods are employed to the existence of trends in the time series (from the 1950s to 2000s) of the annual average high tidal level, the annual average low tidal level and the annual average tidal range at Nansha, Sanshakou and Wanqingshaxi stations.