Co-pyrolysis of three agricultural wastes. namely wheat straw oat straw, and corn cob, have been conducted in a fixed-bed reactor The pyrolysis product yields and compositions formed during co-pyrolysis of agricultural wastes at different ratios (w/w %) were investigated. A synergetic effect is determined on the pyrolysis of WS/OS biomass samples together with each other in terms of oil yield and a synergetic effect is not determined on the pyrolysis of WS/CC mixture. Rio-oil obtained front WS/OS mixture also provides many advantages in terms of the product quality. when it is compared with the oil product obtained by using the pyrolysis of biomass samples one by one.