Abstract: Domestic three-dimension model of engine cylinder block are basically obtained from reverse engineering or provided by foreign companies without the parameters of three dimensional model, so manufacturers cannot modify the model while engine project development due to the lack of modeling parameters. Based on the engine skeleton in the CATIA software, parameterized modeling methods and procedures will be introduced in this paper. This method uses the cylinder block casting process and mold features cylinder model. Firstly, cylinder model was decomposed into functional modules and the total skeleton was defined. Secondly, functional skeletons were established on the basis of the total skeleton, each functional module skeleton can drive the functional model. Lastly, the each functional module can merge cylinder model by Boolean operations. This method can be used to get parametric design for cylinder block model, and support mold design.