Vegetal energy is becoming one of the important energy sources for diesel engine. A test of burning character on S195 diesel engine was carried out using tea-seed oil as the alternative fuel. The results showed that it is feasible to burn mixture oil of tea-seed oil and diesel oil without changing the structure of the engine. When burning the tea-seed oil or mixture fuel in the engine, the exhaust pollution is on decline, but the specific fuel consumption rats and deposit charcoal of combustion chambers and injection nozzles are more than ever. The performance of the engine is rather good when burning the mixture of tea-seed oil and diesel oil in same volume and the angle of pre-oil-supplied is 19^o CA.