The impacting action of flood destroyed dramatically the rural buildings. In this paper, the rural building was analyzed numerically to investigate the destruction of rural building due to the flood impact. The rural building was discretized into 7950 8-node block elements and 4098 Goodman elements to simulate the brick and mortar respectively. The rule impact loading of flood on rural building was calculated using the criterion of gravity similarity according to test results. Finally, the stress, the displacement and the failure process of the rural building are studied. Firstly, the mortar element locates on the wall between the door and the window failure and more and more mortar and brick elements failure with the increasing loading. Finally, the right wall was damaged because the door and the right window decreased its stiffness. Because the failure mortar and brick elements decrease the stiffness of the structure, the displacements of the rural building increased nonlinearly with the increasing loading.