To achieve the purpose of the platform turbocharged gasoline engine development,the model of 1.5 L naturally aspirated lubricating system was built by using the engine CAE technology.The computed results were compared with experimental data,and the correctness of the model was verified.A new lubrication system of the 1.5 L turbocharged gasoline engine was designed based on this CAE model.In order to remain the main oil pressure unchanged,the oil pump displacement of 1.5 L platform turbocharged gasoline engine was increased from 10.4 mL/rev to 14 mL/rev according to the requirements of the new parts of the platform turbocharged gasoline engine.The research results show that when the main oil pressure remain unchanged,the oil flow distributed of old lubricating parts is the same as that of the old system and can meet the lubrication requirements,while the inlet oil pressure and oil flow distributed of the new lubricating parts can also meet the working requirements.