探讨了裂隙非饱和渗流机制 ,认为裂隙尺度上的非饱和渗流实际上是由许多局部开度尺度上的饱和渗流构成的。用重正化理论的方法 ,对裂隙发生逾渗相变时的临界特性进行了研究 ,指出裂隙非饱和渗流存在一临界饱和度值 ,当饱和度小于该值时 ,裂隙中无渗流存在。对裂隙非饱和水力传导度进行了讨论。 The unsaturated seepage mechanism of fractures is discussed. It is considered that the unsaturated seepage at the fracture scale is actually composed of saturated seepage at many local opening scales. Using the renormalization theory, the critical characteristics of percolation and percolation phase transition are studied. It is pointed out that there exists a critical saturation value for unsaturated seepage of fractures. When the saturation is less than this value, no seepage exists in the fracture. The unsaturated hydraulic conductivity of fractures is discussed.