<p>Saturated clayey soils typically exhibit anisotropic flow behavior; however, most existing studies have focused primarily on differences in horizontal and vertical hydraulic conductivity, neglecting the inherent nonlinear flow characteristics of clayey soils. In this study, remolded static compaction clayey soil samples were prepared in a custom-made box with six permeable sides. Subsequently, the permeability of saturated clayey soil samples was systematically measured at various angles ranging from horizontal (0°) to vertical (90°) using the falling-head test method. The results showed that the flow characteristics of saturated clayey soil deviate significantly from Darcy’s law, exhibiting pronounced anisotropy. In addition, Hansbo’s flow equation demonstrated excellent applicability to the test data. Within this equation, the linear segment hydraulic conductivity <i>K</i> decreased with increasing sampling angle and exhibited an elliptical distribution in the polar coordinate system. Both the parameter <i>m</i> and the critical hydraulic gradient <i>i</i>₀ were positively correlated with the sampling angle. This study provides theoretical and practical guidance for predicting foundation consolidation settlement and geological energy applications.</p>