With the large-scale cloud computing data center server globally deployed, its advantages such as low cost,strong expansibility etc. provide convenience for those companies or business units with large amount of data,and save the cost of capital on the construction of the IT environment. But in this data outsourcing environment, this will involve information security and privacy protection. On the premise of guaranteeing the safety and accuracy, this paper presents an outsourcing data storage model based on the protection of privacy .Combined with data privacy protection of mining algorithm, it puts forward the data integrity detection protocol based on data communication. The protocol uses data security technology, starting from the angles of safety, including the security of data transmission, data mining safety, integrity, security etc, making the third party server trustful.