Abstract:The track, intensity and structure of the tropical cyclone (TC) in Taiwan Strait become more complex because of the complicated underlying surface and the influence of the middle and low latitude weather system after TC crossing Taiwan. Thus, it is difficult to forecast the precise position and intensity of TC landing mainland. In this paper, the track and intensity variation characteristics of 81 TCs landing Taiwan and mainland from 1949 to 2017 were analyzed, and the TC positions and intensities in the best track datasets 〖JP2〗of Shanghai Typhoon Institute (CMA/STI), American Joint Typhoon Warning Center (JTWC)〖JP〗 and Tokyo Regional Typhoon Center (RSMC-Tokyo) were compared and analyzed. The results show that most of the TCs weakened except that a few strengthened in the strait. The track deflections are obtained in most TCs in strait, compared with tracks of TC before landing Taiwan Island， but the deflection orientations are different in the three best track datasets. It is more difficult to determine the TC center and intensity because the TC structure is broken down when passing through Taiwan Island. As a result, TC center and intensity records are very different in the three best track datasets. The position and intensity uncertainties of TC increase the difficulty in monitoring and forecasting TC track and intensity.