The embodiment of the invention discloses a decoding method. The decoding method adopts the methods that code stream is stored in a code stream buffer memory after being received, and a preset storage space is reserved at the bottom part of the code stream buffer memory so as to avoid out of bound of the code stream when syntactic element analysis is performed to the code stream; the code stream is read from the code stream buffer memory; the syntactic element analysis is performed to the code stream; whether the code stream is out of bound is judged and corresponding treatment is preformed. The embodiment of the invention also discloses a decoding device. By adopting the invention, the judgment process of the syntactic element analysis course is simplified, and the decoding efficiency isimproved.