介绍了由于雨水入渗，使非饱和土坡的含水量发生变化，而含水量正是与基质吸力有着直接的联系；同时通过分析条件水压力和非饱和土的容重与含水量的变化规律，得到基质吸力、饱和度、非饱和土容重与整个土坡的稳定性规律，也就是安全系数与含水量分布的规律。得出当土坡处于危险状况下的含水量分布，即当土坡中的含水量达到危险含水量时，土坡处于危险状态。因此，通过监测土坡的含水量的变化，获得土坡的稳定信息，为生产和安全提供保障。

This article mainly formulates that rainfall seeping makes the volumetric water of unsaturated soil changing, and the water content relates closely to soil suction. That means soil suction changes with the stability of whole unsaturated soil slope, that is, the safety coefficient has some relationship with volumetric water. So the “dangerous” volumetric water condition cna be determined under which, the unsaturated soil slope also is danger. By monitoring the volumetric water condition changing of unsaturated soil slope, some information of unsaturated soil slope stability can be obtained.