The success of green revolution of 1960?s had resulted in India achieving self- sufficiency in food production system. Use of high yielding varieties, high analysis fertilizers, soil and water management practices had resulted in achievement of improved production and productivity. However, recent years had sow ?plateauing of yield? in the agricultural production scenario. So with a raising population and fastly depleting natural resources, policy planners think of alternative production system which are eco-friendly, cheap, sustainable with improved productivity gains. Indigenous knowledge being evolved as age old treasures with a rich traditional wisdom remains as a best alternative. Keeping this in view a study was conducted to document the indigenous technical knowledge in coastal farming system of Tamil Nadu. The research was conducted in 12 coastal districts of Tamil Nadu. About 240 coastal farmers was selected using random sampling method. Pre-tested interview schedule was used for the data collection process. About 149 indigenous items of coastal areas were collected and rationalised.