This paper presents discussions on the historical development of coastal arrangement technologies with nature (nature friendly technologies). Discussions are also extended to the social acceptance of the tidal-flat construction technology. Mesocosmic experiments as well as the accumulation of field/construction experiences gave us gradual understanding of settlement of the benthic biota into new habitats. As construction works along coasts often require as long as 10-20 years, deep considerations for the future use and impacts of the facilities/sites are necessary with the understandings of long-term social trends. Adaptive management with a long-term monitoring system is one of the attractive ways for the regional application of the nature friendly technologies.