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Abstract It is a difficult research topic of the rule about water flow in the unsaturated intact loess；this subject develops slowly by now，owing to the complex theory and the lagging of experimental method. This article addresses the problems of temporary saturated zone and transport progresses of water in unsaturated intact loess slope. The authors analyze the variation regularities of daily moisture content of soil within the depth of 2–3 m beneath the immersion test pit，discuss the formation of transient saturated zone and migration process，canvass formation mechanism of infiltration regions in unsaturated intact loess slope and migration rules of water in unsaturated intact loess slope. The results show that the process of infiltration in the unsaturated loess slope is the process of continuously enlargement of transient saturated zone；permeability zones and the value of wetting angle are not fixed，and both enlargement as infiltration capacity of water increasing. Permeability zone could be divided into four parts：the first and second parts are the stage of water lateral migration；the third part is the stage of vertical permeability；the forth part is the wetting front of temporary saturated zone；permeability zone in the unsaturated loess would be closed region of approximate oval forever.
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Received: 15 January 2011
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2011, Vol. 30 
