In this study, we researched the habitat of terrestrial crabs, which migrate to the seaside to disperse their eggs in reproduction season, by marking the distribution of burrows and the number of the crab. The eggs hatch at the same time as they are dispersed. The larvae go down to the sea to grow up and after a while, they come back to the same habitat. Therefore, they need the area where the coastal forest, beach and the sea are unified to feel the tidal cycle and migrate safely from the forest to the sea. From this survey, we investigated the relationships between the habitat and environmental characteristics, which are topographic and conditions. As a result, the crabs tend to dig burrows on steep sides which are more than 50% slope in the forest or near the water. Moreover, their habitats are separated each other by the effect of the distance from the water. In conclusion, it would be a good way to protect the habitat that corridors such as rivers or creeks to connect the coastal forests and the sea, and to link each other are built in this area. Moreover, it would be another effective plan to distribute water places like small ponds or springwater in every 50m along the forest.