Abstract: On the basis of reviewing and analyzing existing intensity scales, a 12 grade scale for Chinese historical earthquakes is proposed in this paper. We have adjusted and added the indicators of building damage features and macroseismic effects visible on ground for intensity　Ⅹ toⅫ, and supplemented the social response under different intensity levels. The diagnosis for different intensity levels are explained. Intensity evaluations for 10 domestic and world historical earthaukes are made as practical cases. The evaluation of historical earthquake intensities based on the proposed intensity scale is consistant with that following the original scale.