Abstract: A new methods for error-correcting codes in robot communications for detecting bearing tube in boiler is described. BCH codes is adopted as a error-correcting codes according to the 8 bit controller's feature, and the structure of BCH codes is introduced. The encoding and decoding of BCH codes is realized by searching table. The table of error-correcting codes and syndrome and information codes are built off line and stored in the controller, thus the complicated encoding and decoding in communications is completed by fast searching tables, and the capability of real time communications is improved greatly. All error codes whose error bits are less than 3 can be detected and corrected. For the more, binary search or index search is used in order to enhance the efficiency of the search.