Yogyakarta-Wonosari road precisely in hilly areas, there has been a decrease in road subgrade about 7-9 cm, the subgrade can be seen from the height difference from the road side. At the study site,the soil parameters are in the form of clay, silt and soil in the form of hard rock, resulting the ground become unstable and not strong enough to withstand the rain water .in conditions described above, if the penetration of water goes to the ground,it will become unstable and the weakening will occur, so that the the dynamic loads on the layer will result in consolidation occurre and resulted in subsidence road. This study aimed to analyze the internal and external stability of the retaining wall due to extreme loads using PLAXIS 8.2, by modeling the slopes with extreme loads. It is to know the voltage that occurs at the retaining wall when it receives load and the extreme conditions of the slope, so with this study,it is expected to obtained a picture of the internal and external stability of the retaining wall on the condition. Results of slope modeling  with two conditions of water level which is the water level is normal and the water level is extremes with vehicle load and seismic load,safety factor will be obtained. on the condition if the water level is normal with vehicle load of 1,153 <2 and to the conditions if the water level is normal with vehicle loads and earthquake loads of 1,145 <2, in conditions of extreme water levels,it will be obtained that the vehicle load safety factor is 1,105 <2 and to the conditions of extreme water level with the vehicle load and earthquake load, safety factor that obtained is 1,101 <2. External stability at extreme water level conditions with vehicle load,it will be obtained that stability to the shift is 1,243 <2, the stability of the verthrow is 1,894 <2 and the stability of the carrying capacity is 3,057> 3, while the stability of external on extreme water level condition with vehicle load and seismic load,it will be obtained that stability to the shift is 1,211 <2 , the stability of the overthrow is 1,844 <2 and the stability of the carrying capacity is 3,021> 3. Overview of internal stability of the retaining wall is using the PLAXIS 8.2 program on the pieces A-A 'in conditions of normal water level with the vehicle load ,it  will be obtained the constraint tension, sconstraint = 294, 61 kN / m2 < constraint concrete in 1500 kN / m2 (safe), shear stress t = 116.11 kN / m2 <concrete shear 150 kN / m2 (safe). Overview of internal stability in conditions of normal water level with the vehicle load and earthquake constraint load,constraint tension is obtained, sconstraint = 306.24 kN / m2 <constraint concrete 1500 kN / m2 (safe), the shear stress t = 127.97 kN / m2 <fricative concrete 150 kN / m2 (safe). Overview on modeling the slope at extreme water level conditions with the vehicle load tension,constraint tension is obtained, sconstraint = 307.58 kN / m2 <constraint concrete 1500 kN / m2 (safe). Shear stress t = 129.16 kN / m2 <concrete shear 150 kN / m2 (safe) . Overview of internal stability in conditions of water level is extremes with vehicle load and seismic load constraint tensionis obtained,sconstraint = 296.54 kN / m2 <constraint concrete 1500 kN / m2 (safe), the shear stress t = 105.68 kN / m2 <concrete shear 150 kN / m2 (safe) .Based on internal stability analysis of soil retaining walls and seen from the constraints occur, the walls can still hold the constraint up to the extreme conditions but to the external stability of the retaining wall is unable to resist shear forces, bolsters forces and stability collapsing soil bearing capacity. 
Keywords : Stability of Retaining Wall, Ekstreme Condition, Program Plaxis 8.2.