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中文摘要：
历史时期关中地区蝗灾的发生频率具有明显的波动性，且随着历史的发展，有在波动中上升的趋势。唐朝中期以前，关中地区蝗灾的发生频率较低，波动幅度也较小，之后，关中地区蝗灾发生频率的波动幅度明显增大，蝗灾的发生次数明显增多。唐朝后期（801—850A．D．）、明末清初（1601—1650A．D．）和清末至民国（1851—1950A．D．）是关中地区历史上蝗灾记载最多的时期。与水灾的发生频率相比较，关中地区的蝗灾与旱灾的发生频率表现出更强的一致性，尤其是900AD（唐末）后，每一个蝗灾频率高峰几乎都与旱灾频率高峰完全同步，说明在关中地区蝗灾的发生与旱灾具更强的相关性。
英文摘要：
In the historical period, the frequency of locust disasters in Guanzhong region fluctuated obvious , and showed increase tendency in fluctuation. Before the mid-term of the Tang dynasty, the frequency of plague of locusts was lower in the Guanzhong region, and the fluctuation range was also less. Then the fluctuation range of frequency increased obviously, and the frequency of plague of locusts increase obviously. The later stage of the Tang dynasty （ 801-850 A. D. ）, the end of Ming and the beginning of Qing（ 1601-1650 A. D. ） , and the end of Qing dynasty to the Republic of China （ 1851- 1950 A. D ） were the periods when the records of plague of locusts were the most in the Guangzhong region. Comparing with the occurring frequency of flood the frequency of drought, locust disasters appeared more strong consistency. Especially after 900 A. D. （the end-term of Tang ）, each frequency peak of locust disasters nearly complete synchronism with a drought frequency peak, evidently the occurring of locust disasters had more strong correlation with the drought in the Guanzhong region.
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