Abstract: Vegetable energy has become the essence fuel of farming diesel engine. On the basis of burning tea seed oil in the S195-diesel engine for burning performance, exhaust experiments burning degreased tea seed oil were taken on the smoke, HC, NOx, and CO. Electronic microscope was employed to determine the microstructure of carbon particle. Results showed that it was feasible to combust the preprocessed tea seed oil, or mixture of tea seed oil with diesel oil on the diesel engine. The burning performance was good, which the exhaust was less than that of diesel oil, and the carbon accumulated on the fuel jet reduced. So the combustion was more qualified.