Based on the continental reinforced slopes in some wharf engineering of Chongqing port, the reinforcement mechanism and the stability of high and steep geosynthetic-reinforced slopes under its own weight are studied through centrifuge model tests and two-dimensional finite element methods. The centrifuge test results show that the failure mode of the reinforced slope is different from that of slope without geosynthetic. The slope shoulder collapses in the former, while the stress concentrated at the 1/6~1/3 of the slope height in the latter. The strength of the fillings especially those at the middle and lower part of the slope has a decisive influence on the slope stability. If the upper fillings are changed with low strength soils alone, the stability of the slope might decrease rarely. The numerical analysis firstly is tested and verified by the centrifuge tests results, and then is applied to the analysis of the factor of safety and the stress and displacement of the prototype slope. The comprehensive analysis method with centrifuge tests and numerical simulation can be used in other reinforced slopes and geotechnical engineering projects.