The knowledge about the condition of the ground is a crucial factor that controls damage due to natural disaster . In order to acquire this knowledge , the authors have looked at the fact that the conditon ofthe ground is closely related to the landform . A method of obtaining landform clussification was proposed in the previous study . This paper aims to evaluate amplification factors ofthe surface ground using landform classification. lt was found in this study , landform has a significant lnfillence Qn the amplification factor ,