—Blockchain is essentially a distributed ledger shared by all nodes in the system. All nodes in blockchain are equal, and each node holds all transactions and blocks in the network. As the network continues to expand, the data rises linearly. Participates are about to face the problem of storage limitation. Blockchain is hard to scale. This paper introduces ICIStrategy, a multi-node collaborative storage strategy based on intra-cluster integrity. In ICIStrategy, we divide all participates into several clusters. Each cluster requires holding all data of the network, whereas a node within the cluster does not need to maintain data integrity. It aims to solve the storage pressure by reducing the amount data that each participate need to store and reduce communication overhead by collaboratively storing and verifying blocks through in-cluster nodes. Moreover, the ICIStrategy could greatly save the overhead of bootstrapping. We show the mode of operation in our strategy. We further analysis the performance of ICIStrategy and conduct simulation experiments. The results of several comparative experiments show that our strategy just needs 25% of storage space needed by Rapidchain, which indeed solve the problem of storage limitation and improve the blockchain performance.