It is an issue to choose an appropriate capillary pressure-saturation curve in the research of unsaturated fractured mass. Based on the characteristic of the unsaturated fractured mass

the research on the capillary pressure-saturation curve in an unsaturated fractured mass is summarized. It can be seen that seepage in an unsaturated fractured mass has some special characteristics including capillary flow

film flow

preferential flow and facture-matrix interaction; three methods to establish the capillary pressure-saturation curve

including physical laboratory

numerical simulation and mathematical computation; and all the results of these methods are also summarized. Finally

according to the characteristics of the seepage in an unsaturated rock mass and all these result of the capillary pressure-saturation curve

the following results can be concluded: (1) there is no capillary pressure-saturation curve which can reflect the other characters of the seepage in unsaturated rock mass except the capillary flow; (2) it is a convenient method to build the capillary pressure-saturation curve by numerical simulation and mathematical computation; (3) the capillary pressure-saturation curve simulated by Brooks-Corey(BC) model is better than by van Genuchten(VG) at initial stage during drainage

but worse at the last stage.