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Abstract: The use of fly ash in Portland cement concrete (PCC) has many benefits and improves concrete performance in both the fresh and hardened state. Fly ash use in concrete improves the workability of plastic concrete, and the strength and durability of hardened concrete. Fly ash use is also cost effective. When fly ash is added to concrete the amount of Portland cement may be reduced. Mix design of concrete with fly ash for high rise building and to study the consideration while designing a concrete mix of high grades. Now a day’s use of fly ash as a partial replacement of cement is a common. And the demand is increasing day by day particularly for making high strength and high-performance concrete. Many researches done for the use of fly ash as a supplementary cementitious material. High volume fly ash concrete as a subject of current interest all over the world. Thermal power stations are left with an undesirable by-product, fly ash, in large quantities which is not able to effectively utilize or dispose of. The utilization of fly ash in concrete making to control the environmental pollution as well as it will be economical. Analysis of how compressive strength is affected due to with various proportions of cement & Fly ash in a concrete.