An index of violent typhoon event affecting Hainan Island (HNVTE) is defined to better determine the occurrence of the HNVTE according to the data from Hainan natural disasters. 15 violent typhoon cases were selected by using the index during 1967-2015, then the precursory factors of the HNVTE are analyzed. The results show that the HNVTE is benefit from the cooperation of multi-time scale factors: The abrupt warming of the SST (sea surface temperature) over the north western Pacific (subtropical high being stronger) in the late 1980s may provide the decadal scale background for the decrease of HNVTE; The combination of ENSO and Stratospheric quasi-biennial Oscillation provides an interannual anomaly background for the HNVTE variability. The moderate La Ni?a state during the cold period and the moderate El Ni?o state during the warm period in the Western Pacific are favorable for the occurrence of HNVTE, but the HNVTE activity is inhibited by the low-level strong westerly shear under the stratospheric westerly phase. The occurrence of HNVTE can be well identified by the BEST-QBO synergy index constructed from the SST interdecadal phase, ENSO cyclic phase and intensity, and QBO phase and intensity of the Western Pacific sst, which can provide a useful signal for HNVTE climate prediction.