The invention discloses a block storage method applied to cloud computing. The block storage method comprises the steps that: a client sends a request instruction for acquiring a distributed storage node grouping list to a cluster management server; the cluster management server acquires a request instruction according to the distributed storage node grouping list, and returns the distributed storage node grouping list to the client; and the client exchanges data with distributed storage nodes directly according to the distributed storage node grouping list. The invention further discloses a block storage system applied to cloud computing. The block storage system and the block storage method improve the access efficiency of data stored in a cloud computing block.