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In Taiwan area, the instrumental observation of earthquakes has been initiated since 1898, and up to 2000, about 180,000 earthquakes have been accumulated in the synthetic catalog organized by the Central Weather Bureau of Taiwan (abbr. CWB). In this study, we aim to have a systematical comprehension from preliminary statistical analysis of seismicity in terms of Taiwan’s seismotectonics. We firstly applied a completeness test for the CWB seismicity catalog for determining the reliable records which can be considered to correspond with Taiwan’s tectonic activity. Afterward, b-value and z-value have been realized after such reliable records. The b-value analysis has extracted the relationship between the seismic behaviors and tectonic setting. The application of the z-test demonstrated a series of rate changes before and after the Chi-Chi earthquake.