Environmentally friendly or green building materials are becoming more widely used as our society becomes aware of harmful consequences associated with the use of standard practices in industrial production. This leads to growing tendency of recycling of waste materials and using them production of particle boards. Particle Boards are produced from Municipal solid waste, agro-waste materials such as rice husk, jute sticks, waste wood, sugarcane waste, kitchen waste, maize cob etc. The mechanical properties such as high surface hardness and flexural strength plays a vital role in the efficient usage of them for domestic and industrial purposes. All these properties majorly depend on the kind of raw material used and these properties may be improved for the quality betterment of the products and also their applications can be extended. The present study deals about the optimization process parameters (Pressing Temperature, Pressing Time and Resin content) using grey rational methods for Maize Cob particle board production and their mechanical properties for improving flexural strength and Hardness. Key words:- Grey rational methods, Optimization