The method includes: deciding if current CCTrCH of the current target user contains TFCI code word; making detection of enabled code track and shift training sequence for the first radio frame in each transmission time slot; decoding the TFCI code word; calculating the state of current target user in the enabled code track and in the valid shift training sequence; in remaining transmission time slot, setting detecting result of relevant code track and shifting training sequence; outputting message of valid shift training sequence and enabled code of current target user. The invention can avoid data loss in first radio frame, and overcome the falling of system performance caused by detection inaccuracy for shift training sequence and enabled code track.