Abstract：Research purposes:Based on observating some natural characteristics of loess，the effect of water was discussed and relationship between loess slope and effect of water was analyszed，so that influence of water to slope stability was fully considered and slope ratio and safeguard procedures was designed safely and reasonably when engineering slope was to designed．
Research conclusions:The structure strength and the shear strength of loess was extremely sensitive to the water． The of cohesion of shear strength was quikly reduced as moisture content increased． Slope stability depended on whether the seepage belt was formed in the slope surface which strength was promptly decreased as water content increasing． The needle pore determined the loess up － right． The stable natural slope of loess and caves were the scientific choices．
Wang Zhengang，Zhao Fasuo，Wang Hui，etc． Research on Influences of Slope Surface Erosion on Loess Slope Stability［J］．Journal of Water Resources and Architectural Engineering，2007(1) : 56－72．
Hu Zaiqiang，Shen Zhujiang，Xie Dingyi． Research on Structural Behavior of Unsturated Loess［J］． Chinese Journal of Rock Mechanics and Engineering，2000(6) : 775－779．
Wang Jianhua，Huang Nuan． Reliability Analysis of Stability for Unsaturated Loess Slope under the Condition of Rainfall Infiltration［J］． Water Power， 2006(10) : 38－40．
Zhang Luming，He Min，Zheng Mingxin，etc． Effects Analysis of Rainfall Infiltration on the Landslide Seepage Field and Stability［J］． Journal of Railway Engineering Society，2009(7) : 15－19．
Zhu Lijuan， Wang Tiexing， Hu Yi． Influence of Rainfall on Moisture Content in Unsaturated Loess Slope［J］． Chinese Journal of Underground Space and Engineering，2009(1) : 95－99．
You Mingqing． Study on Landslide of Homogeneous Soil with Calculus of Variations［J］． Chinese Journal of Rock Mechanics and Engineering，2006 (S1) : 2735－2745．
2011, Vol. 28 
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