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One-dimensional combustion performance of a turbocharged V-type eight-cylinder diesel engine was computed by used of WAVE code. The parameters of compress ratio, intake temperature, intake pressure, fuel injection quantity, advance angle of injection, fuel injection rate and fuel injection duration were changed so as to study quantificationally how these parameters affect the power, fuel consume, the max combustion pressure, exhaust temperature and emission of the diesel engine. The computational results could help to accomplish the preliminary optimization of several parameters for combustion matching and supplement experimental experience and exploit new products.