Self compacting Concrete (SCC) is a high performance concrete, that can flow under its own weight to completely fill the form work. This concrete has an ability to compact without any mechanical vibration.SCC is suitable for placing in difficult conditions and also in congested reinforcement. It is becoming a popular choice in concrete industries, due to ease of placement in situations with heavily congested reinforcement and where compaction becomes diffficult . This paper envisages the variation of fresh state, , properties of self compacting concrete containing fly ash in different percentages 0%,10%,20%,30% by weight of cement as partial replacement of cement. The workability characteristics like filling ability, passing ability have been assessed using slump flow and T50 time, V Funnel time, L-Box blocking ratio, as per EFNARC Guidelines.