Abstract: In order to explore the fitting approach for SWCC of undisturbed loess, the SWCC of loess soil samples in Baoji, Qishan and Yangling were fitted through 5 conventional fitting methods, and also results of indoor dehumidification experiment of matric suction pressure plate were compared with the fitting data. The results show that Fredlund & Xing, van Genuchten and Brooks & Corey fitting methods can better reflect undisturbed loess SWCC, while van Genuchten & Burdine (VGB) and van Genuchten & Mualem (VBM) are not suitable for describing undistributed loess SWCC as their residual moisture contents are different from practical condition. Finally, a simple and practical engineering SWCC prediction formula was proposed and verified by tests.