The Chinese Academy of Sciences Coupling Interface Generator (CAS-CIG) is designed to address the complexities of the development and coupling of different component models in Earth System Models based on the Coupler 7 of the Community Earth System Model (CESM). Its application in the Chinese Academy of Sciences Earth System Model (CAS-ESM) is described. The CAS-CIG automatically generates the template coupler code through a simple configuration file when a component model is accessed, enabling different component models to be easily ported to CPL7 to create model cases. Combined with the automatic generation of compiled scripts, the pre-compilation and run directories are directly formed. The component model integration, model selection, experimental setup, and platform migration can be all accomplished in the CAS-CIG.