The fractal dimension is calculated for the geometrical distributions of the seismic stations of three networks (the old CWB seismic network, the TTSN and the CWBSN) in Taiwan based on the correlation integral algorithm proposed by Hirata et al. (1987). Results show that the distribution of the data points of correlation integral for the old CWB seismic network distribute very irregularly and cannot be approximated by a fractal set point. The fractal dimension value for the TTSN (1.18¡_0.02) is less than that for CWBSN (1.56¡_0.01). this indicates that the dimension resolution and the detectability of sparse phenomena are lower for the former than the latter.