Abstract: In view of problems of jumbled service level and long service period of integrated mine wide automation system, the paper put forward a scheme of using service level agreement to classify and grade in-sale services and after-sale services, and introduced categorization management and content of service level agreement in terms of five aspects of installation and debugging services,system promoton services, customizing and upgrading services, technique supporting services and annual operating services in details. The service level agreement can carry out the idea of IT service management in contract signing and implementation process of integrated mine wide automation system, and can play a big role in service period, project acceptance and received payments of contract.