In this paper, using Hamasaji (Limonium tetragonum){the extinction uneasiness species}, Hamamatuna (S. maritima), Fukudo (Artemisia fukudo), Hamagou (Vitex rotundifolia), which is the kinds of the beach plant as an example, it grasped these habitat distribution and an inhabiting situation in Kumamoto Prefecture. It finds that the seashore, which has sand near the beach line in case of the high tide, is decreased. It investigated the situation of the seashore environment in Kumamoto Prefecture. There are few natural sandy beaches in Kumamoto Prefecture. The seashore, which has sand in entire of littoral, is not 1%. It considered relation between the inhabiting situation of the beach plant and the seashore environment. It found that the habitat of the creature in the seaside is lost by the artificial factor.