Due to increase demand of energy, increasing price of petroleum fuels, depletion of petroleum fuels, and environmental pollution by these fuel emissions, it is very necessary to find the alternative fuels. This work focused on use of hybrid blends of Karanja and Cottonseed oil Biodiesels. In this work 20% and 25% blends are used and the performance and emission tests were conducted on single cylinder, 4-stroke, water cooled CI engine by running the engine at a speed of 1500rpm, at a compression ratio of 16.5:1 and at an injection pressure of 205bar and performance parameters like BP, BSFC, BTE and the emissions like CO, HC and NOx are compared. It was found that the blends gave comparatively good results in respect of performance and emissions.