Cloud computing is popular ,and adopted because there is many security and privacy. A issue found in cloud storage is, when client out-source data to the cloud storage, the clients don’t know that their data is damaged or not. Also the computational burden is too high. To tackle the issue, OPoR, another distributed storage method including a distributed storage server (DSS) and a TPA is proposed here. TPA is thought to be semi-legitimate. Specifically, we consider the assignment of permitting the TPA for the cloud clients, to pre-process the information before transferring to the DSS and later confirming the information quality. OPoR outsources the overwhelming calculation of the label era to the cloud review server and takes out the contribution of client in the examining and in the pre-processing stages. Besides, we secure the Proof of Retrievability(PoR) model to support information integrity, and in addition assurance security against reset assault dispatched by the DSS in the transfer stage.