In view of the abnormality of the inter-ten-year process time of different decoding display mechanisms, the paper analyzes and studies the IRIG-B timecode coding rules and time resolution mechanisms. Focusing on the analysis of the problem through the time-hopping test spanned the whole ten years, combined with the principle of different decoding display mechanism, using the matching method, the annual information display jump phenomenon is the conclusion that the decoding display mechanism is not in harmony with the existing time information coding mechanism. The correctness of the analysis was verified by multiple sets of time-hopping tests. The results show that it is of great significance to study and select the best time resolution display mechanism according to the different requirements of different terminals for time resolution display.