Due to the rising of mobile technologies and cloud computing, the operation model of information technology service had become different than before. The impacts among user, customer, service provider, and vendor will be heavier. With some events related to cloud computing such the crashed of Amazon servers, unstable status of Apple Siri, and the information leakage occurred by Microsoft and Google, we could know the operation model of cloud computing service should include the whole roles as user, customer, service provider, and vendor. In this article, we proposed a conception of service level management within cloud computing service environment. The whole picture not only focuses on each role to enhancing their rights, but also makes guarantee to every role within this service line.