Concrete is most widely used material which include cement as binding material. Fly Ash an industrial waste is rich in silica and being industrial waste it is difficult to dispose it Fly ash and presence of lime released by Hydration of cement act as binding, material Therefore Fly Ash can replace the cement. More will be Fly Ash used in concrete less will be the burden of pollution on the environment. This study was undertaken with to study available design methods incorporating Fly ash and suggest a most suitable one for future use. In order to achieve this objective the cubes were cast of M20, M25 and M30 of concrete by method of mix design i.e. IS10262: 1982, IS 10262:2009 and research paper by Shantanu Bhanja (January 2015).