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Abstract: It’s an experimental study on coir fiber using in concrete. The aim of the project is to increase the strength of concrete and maintain cheapcost. Thehigh cost of conventional construction material affects the economics of the structure. Coir fiber are the natural materials which is abundantly available in tropical region .which will increase the strength of concrete by producing infinite variance in strength compared to normal concrete. The coir fiber by adding 5%, 10%, 15% and 20% in concrete. The strength characteristics such as compressive strength and split tensile strength of concrete mixes are found for 7 days,14 days and 28 days of curing period and results are analyzed and compared with the regular (conventional)mix. Result data clearly shows percentage increases in compressive strength for M20 grade of concrete in 7 days and 28 days with respect to the variations in % addition of coconut fibers in structural concrete to enhance the mechanical properties of concrete. 20% gives optimum compressive strength.