In order to improve the reliability of optical storage data, this paper proposes an error correction methodology in optical storage system which is based on redundant recovery code technology, it relates to the field of optical disc data storage. The methodology consists of two opposite processes – recording and retrieving. While recording data, firstly, splitting user data into blocks and encoding it with redundancy recovery code; next, organizing data blocks as UDF (universal disc format) file system; finally, modulating and encoding UDF file system data as strip group according to the optical disc physical format and recording it into optical disc. In contrast, while retrieving data, demodulating and decoding data strip group which is stored in optical disc at first; later, following UDF file system format to resume user data; in the end, verifying user data with redundant recovery code and return it to user. The methodology is compatible with the standard optical disc file system, and improves the fault tolerance efficiently. Original blu-ray physical format signal error rate is 4.1×10-13, the signal error rate can be down to 7.4×10-24 after redundancy recovery code check.