Abstract: Recognizing core's porosity distribution feature clearly and characterizing it quantitatively is very important when studying core sample's seepage feature.By scanning dry core and the core saturated with formation water, the porosity distribution features of each scanning slice and the whole core were obtained, and the porosity distribution images of each slice, orthogonal and three dimensional were reconstructed.Statistical features of core porosity distribution could be derived from frequency distribution and cumulative frequency distribution curves of porosity.The level for studying porosity distribution features of core were divided into two levels, 'slice level' and 'core level'.Seven parameters were selected to characterize the central tendency, dispersion and distributional patterns of porosity distribution.It's showed that, the porosity distribution of different scanning slices varied a lot, and core's porosity distribution feature could be characterized well by using the seven parameters.