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Recently, environmental problems such as global warming and an energy problem arise. Therefore, the use of the biomass energy is tentatively starting all over the world. BDF (BioDiesel Fuel) is one of the approaches to reduce emissions of CO_2 and to break dependence on fossil fuels. Biodiesel can be used in pure form or may be blended with petroleum diesel at any concentration in most injection pump diesel engines. However, BDF has an effect on copper-based materials (e.g. brass), zinc, tin, lead, and cast iron and it also affects types of natural rubbers. And some of the molecules aggregate and form crystals when biodiesel is cooled below a certain point. For example, biodiesel produced from low erucic acid varieties of canola seed starts to gel at approximately -10 °C. Moreover, a lot of adulterated glycerin are produced in reforming vegetable oil.In this study, water-vegetable oil emulsion fuel is used experimentally for Diesel engine fuel. As a result, the diesel engine can be worked well using emulsion fuel, the performance such as torque, power and indicated power are not so inferior to those using fossil oil.