Hydraulic conductivity is an indispensable parameter for modeling soil water and solute transport. In peanut and citrus land，water retention curves were determined by pressure membrane using undisturbed soil cores and by FDR and Watermark (R) granular matrix sensors installed in situ. According to van Genuchten’s parameters，unsaturated hydraulic conductivity (K(h)) was predicted. Meanwhile, hydraulic conductivity was measured by zero flux plane method in situ as a standard parameter, so that we could assess the two methods above determining K(h). Overall，in peanut land use, the two K(h) curves from soil cores or from in situ were consistent, but it was not well in citrus land use due to the spatial variation of plant root distribution. This research assesses different methods to determine K(h) in red soil region.