This passage picks up the case of the loess landslide in Zhangcunwan, Jingyang county, Shaanxi province for the research of the formation mechanism and stability analysis of loess under the condition of irrigation, which raises the dynamic equations of loess landslides induced by irrigation, and applies the equations into the case in the landslide in zhangcunwan. Besides, the passage has given the trajectory equations in the landslide in Zhangcunwan and verifies, as a consequence, the results can be calculated accurately and it generally tallies with the actual one. The internal soil anti-shearing strength and the safety factors will decrease when the groundwater level rises 1m per case till the stabilizing force decreases by the soil sliding force when the whole slope if in the state of limited equilibrium. As the contents of irrigation rising continuously of the water level, the anti-shearing strength will be outdone by the shearing strength and this shall bring about the loss of the stability of the slope.
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