Abstract:-  This project involves in certain investigations to fabricate and test the mechanical properties of a polymer composite with reinforcing a novel fiber material into the matrix. A polymer matrix is generally a plastic based petroleum by product which is widely used in all manufacturing industries for various applications in day to day life. Into a polymer matrix different synthetic and natural fibers are commonly reinforced to improve the mechanical properties of the composite material. This study involves in certain investigations to fabricate and test the water absorption properties of a polymer composite by reinforcing a natural fiber in flour based or powdered form, into the matrix. Since plastic based polymers are banned nowadays due to its less environment friendliness, this attempt has undertaken a natural and biodegradable polymer material, which is Poly lactic acid (PLA). The areca fibers, Natural fiber is reinforced with PLA in weight ratios of 5, 10, 15, 20, 25 and 30% respectively to obtain six individual samples which are processed using injection molding technique.