The authors calculated the mean damage indexes of Nantou county、Taichong county、Taipei county and Miaoli county based on the building damage of these regions resulting from the Chi-Chi Earthquake.Then the authors calculated the average value of PGA、PGV、PSA、PSV、PSD in these four regions and conducted the linear regression between the average value and the mean damage index based on the least-square method.The result shows that PGV has very good correlation with the mean damage index and the corresponding cor...