Based on the analysis of the heterogeneity of channel mouth bar reservoir, the horizontal variation function is given and matched by using the porosity data from the multi directional horizontal wells. Combined with the variation function of vertical wells, it is considered that the statistic distribution of the deltafront mouth bar reservoir parameter in horizontal direction is similar to that of reservoir parameters in vertical direction, and the variation functions are dominated by spherical model. The vertical range of vertical wells averages about12 m,which represents the vertical thickness of a single mouth bar; the plane long-axis range of horizontal wells ranges from 24 m to 36 m and the short-axisrange of them ranges from 8 m to 16 m, which represent the length and width of single mouth bar, respectively. The ratio between the long-axis range and the shortaxis range is about 2∶1~3∶1; the ratio between the plane long-axis range and the vertical range is about 20∶1~30∶1, and the ratio between the short-axis range and the vertical range is about 6∶1~13∶1.