Abstract: The word Tsunami is of Japanese origin, which means harbor wave, tsunami are large waves that are sea floor is deformed by seismic activity vertically displacing the overlying water in the ocean. The quake occurred at a place where several massive geological plates push against each other with massive force. Tsunami has very low height while traveling over Deep Ocean. High waves occur only when it reaches the shallow waters, typically near the coast. The mega thrust earthquake measuring 9.2 at Richter scale of the western coast of northern Sumatra, Indonesia was the largest of its type since the 6.2 magnitude Good Friday earthquake of Alaska in 1964. The aim of the study is to assess the problems of tsunami affected children. The present descriptive study was carried out in one of the coastal village in Nagapattinam District . Census method was adopted and data was collected from 60 respondents.