Crop residue left in the field after grain harvests have a large potential as a bioenergy feedstock. Crop residues of interest for bioenergy include; wheat straw, soybean straw, and rice straw, paddy straw etc. Paddy straw and wheat straw are potential substrate which can be exploited in industries in future for bioethanol (biofuel) production as they are cheap, abundant and high cellulose content. In this study rice (paddy) and wheat straw had been given both acid (1%-2.5%) and heat treatment (100