To increase bearing capacity of foundation, geosynthetic is laid beneath the foundation. In the previous research, the authors investigated the reinforcement mechanism by changing the length and the laying depth of the reinforcement (Nakai et al, 2009). In the present study, for getting more bearing capacity, reinforcing effect in the case that each edge of the reinforcement is fixed with the soil is investigated. For this purpose, 2D model tests and the corresponding non-linear finite element analysis are carried out. In these tests and simulation, the depth of the reinforcement is changed under two kinds of length of reinforcement. Reinforcing effects not only under concentric load but also under eccentric load are discussed. It is revealed that a significant increase of the bearing capacity is observed in the model tests when the reinforcement having mostly the same length as wide of the foundation or a slightly larger length is set up in the ground with an appropriate depth under both concentric and eccentric loads. The results of numerical simulation in which the stress-stain behavior of the soil and the frictional behavior between soil and reinforcement are properly taken into consideration shows a good agreement with the observed results.