SIE information system operation and maintenance service provides customers with menu based optimization, maintenance and patrol inspection services, including equipment maintenance, system maintenance, application maintenance and desktop maintenance. Customers can freely choose the combination. The service methods include remote and telephone support, on-site support and emergency response. The service mode is flexible, which can be single time, monthly or yearly. The corresponding frequency of on-site and patrol inspection can also be determined according to the actual requirements. To ensure service quality, service level agreements (SLAs) of different levels can be signed.