The index Model(iModel) service means different levels of business activities or functions for the enterprise, which are extracted after a business role analysis of enterprise informatization, business process analysis, the analysis of key performance indicators evaluation and a series of business. These business activities or functions can be used as reusable resources. Aiming at the informatization of enterprise, the connotation and target model of service are expounded; the index model of service function and related business are studied in detail; the overall framework of a service index model, business process, and Extract-Transform-Load(ETL) data writing process are designed. This work can help enterprises to optimize business processes, improve the information service efficiency, which meets the needs of current development of the information age.