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According to the theory of unsaturated seepage, a 2-D geometric model of unsaturated loess slope, combined Richard equation and van Genuchten equation, considering water migration, seepage velocity and changes of negative pore water pressure, is established. And water migration, the change of seepage velocity and negative pore water pressure of the model were simulated and analyzed by applying COMSOL software. The results show that the negative pore water pressure decreases dramatically asfatcat:h7sibmwesndy7jjmrk43skqami