This study is focused on the serious subsided areas -Taisi and Wankon, which are located at the seaside of the western Taiwan. The transfer function models between groundwater level fluctuation and ground subsidence are formulated by time series analysis. These transfer function models are used to estimate the subsidence response and to back analyze the consolidation coefficient (Cv) of the equivalent consolidated layer, under the situation of unit (1 m) reduction of groundwater table. The analysis results show that the total subsidence of Taisi, which has thicker fine-grained consolidated layer, is larger than Wankon, and the consolidation time of Taisi is longer than Wankon. The consolidation coefficients from back calculations are nearby the low limit of the laboratory tested data distribution extent. Finally, the groundwater level fluctuations induce significant immediate settlement according to the two variate cross correlation function analysis under monthly time scale.