The invention discloses a redundancy storage method for encoding files through a Vandermonde matrix. At the time of storage, multiple data blocks obtained through segmentation after encoding are dispersed to multiple storage service nodes, a chord ring is used for quickly finding and locating the data blocks of the files, and the data blocks are decoded and combined to be read finally. By means of the scheme, autonomous management of the storage nodes and cooperation can be realized to a certain degree, as a result, high availability, high flexibility, a high storage utilization rate and other properties can be provided for a cloud storage system, the utilization rate of cloud storage resources can be increased, rental cost is lowered for a user, and the expansibility of an application is improved. The scheme can be applied to the field of cloud computing and cloud storage.