【Abstract】 Objective To study the influence of season, temperature and humidity to the seasonal fluctuation of Haemaphysalis bispinosa.  Methods Investigate 3 d in succession in the fixed sites per ten days monthly, the ticks were captured by the flag (90 cm×60 cm) at its active peak. The average quantity of ticks captured in successive 3 d per ten days was counted, and the temperature and humidity were recorded. The curve of average ticks number to time was drawn. Results The ticks captured belonged to H.bispinosa. Its density began to increase since April, and it had two population peak, one was in May and June, the other was in September and October.  After October, it decreased obviously, and its density was minimum in February and March. The activity peak of ticks was perhaps from May to June, and its propagation peak was from September to October. The curve of temperature change and the seasonal fluctuation of H.bispinosa was very similar, so the combination of humidity and temperature possibly affected the activity of H.bispinosa. Conclusion H.bispinosa could be active in the whole year, and the Summer and the Autumn were its activity peak.