In recent years, cloud storage service has become a faster profit growth point by providing a comparably scalable, position-independent, low-cost platform for client’s data. Since cloud computing environment is constructed based on open architectures and interfaces. It has the capability to incorporate multiple internal and external cloud services together to provide high interoperability there can be multiple accounts associated with a single or multiple Service Providers (SPs). So, security in terms of integrity is most important aspect in cloud computing environment. Cooperative Provable Data Possession (CPDP) is a technique for ensuring the integrity of data in storage outsourcing.