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In this paper, a tide forecasting tool called T_TIDE based on the classical harmonic analysis is introduced. The measured tide data are harmonically analyzed and tide forecasting was made by using the T_TIDE and the characteristics of tides at L俟si Tide Station (LSI Station) and Lianyungang Tide Station (LYG station) along Jiangsu coast are studied. The results show that the accuracy of T_TIDE in tidal prediction of Jiangsu coastal tides is highly satisfactory, which can provide tidal forecasting service and theoretical support for selection of the window period for coastal construction. M2 is the main tidal constituent at both LSI station and LYG station. The type of tides at both stations is all semi-diurnal. At LSI station, the amplitude of M2 presents an upward trend from 1998 to 2012 while at LYG station, the amplitude of M2 gradually decreased between 1995 and 2001 and increased between 2001 and 2012. Whereas, the phase-lag shows a significant downward trend at both LSI station and LYG station. Sea level changes at the two stations are also studied and the statistical results illustrate that the sea levels at LSI station and LYG station present an increasing trend and a decreasing trend, respectively. [ABSTRACT FROM AUTHOR]