Biodiesel is investigated as the main alternative fuel for compression ignition engines. In this research work properties of biodiesel fuel with nano-particles are determined. Combustion parameters such as density or specific gravity, viscosity and calorific value of different types of biodiesel fuel blended with nano-particles such as cobalt oxide and iron oxide are presented in this article. Cobalt and iron oxide nano particle was added with jatropha biodiesel in mixed proportion of 10,20,30,40,50,60 parts per million. The range of nano particle size was 30-70 nanometer.