Abstract: In the growing concern of awareness regarding sustainable building material and environmental issue, Compressed Stabilized Earth Block (CSEB) gives the view of energy efficient, cost reduction and environmental friendly building materials, overall contribution on the sustainable development. Different research workers have contributions on the Compressed Stabilized Earth Blocks in terms of different parameters. CSEBs are eco-friendly and as these blocks are un-burnt products, during production no coal or burning material is needed. So, it does not produce any harmful gases during production. In this paper, result of test of soil that has been used in the production of CSEB is shown. Highly compressed un-burnt blocks have been prepared in the laboratory with different composition and varying proportions of sand, clay and stabilizers such as lime, cement etc. Fly ash is also used as stabilizer in replacement of cement. The strength of different blocks are determined and compared to find the composition which gives highest strength and also to compare between different blocks to get the optimized composition and proportion in terms of economy and strength.