Global instability has been constantly appearing in the early stage of application of three dimensional geonet slope protection. In this paper

we develope a three-dimensional finite element model on three dimensional geonet reinforced slope by using ABAQUS. The displacement at characterization point in slope shoulder was used to determine the instability of the slope. We computed and compared the safety factor of slope with and without geonet under different rainfall conditions and explored the plastic zone distribution and slope displacement at the instability point. Lifting angle and damage mode of above two kinds of the slope were experimentally investigated in slope lifting test analysis

and test results are compared with simulation. Both experimental and numerical results show that three-dimensional geonet can only slightly improve the stability of slope. However

the intensity of the rainfall has more pronounced effects on the slope stability. We also observed that with the application of both geonet and rivets

the integrality of slope can be improved.