Coastal erosion is one of the major problems all around the world. Time Magazine even list of the major city which will be disappear soon in the future and Bangkok is one of the city in the top list. What is coastal erosion? Coastal erosion is an event occurs to land cost to sea or coastal area, in which the area is made of sand or normal mangrove forest not stone of cliff. Land will slowly accumulated by sea water as the sea level is higher and the sea waves are keep continuing erode the land with eave force and salt (acid). Ban Khun Smuth Chin is one of the villages in the middle part of Thailand which is connected with the Gulf of Thailand. This small village is now facing one of these major problems that consume 2/4 of the village area and keep continuing. The villager has tried many different method and way to prevent this problem to consume all of the village area. This report is try to suggest the way to prevent the problem of coastal erosion to the villager to avoid and can stop the coastal erosion in the Gulf of Thailand.