Soil saturated hydraulic conductivity (Ks) is one of the most important hydraulic parameters, and its determination in the laboratory has been shown to be influenced largely by column size. This study estimates measurements of Ks in the lab using six different column sizes: 5, 10, 15, 18, 23 and 29.5 cm. Constant water head method was used, and disturbed Lou soil, a typical clay loam soil in Guanzhong region, was selected. Results showed that Ks decreased over time, and the range of descending changed greater at the initial stage than later. At the column size range of 5 -30 cm, Ks decreased with increasing column size. A linear regression analysis of two data sets of Ks and column size showed that the Ks data were linearly correlated with the size data following y =0.000 4x +0.003 7(R2 =0.965 1). This study may serve as reference to choose reasonable time and size in measuring the Ks of disturbed soils.