中文摘要：

通过对历史文献资料的搜集、整理、分析，对清代关中地区蝗灾的时间、空间特征和灾害的等级及其成因进行了研究。结果表明：关中地区自1644至1912年的268年中，共发生蝗灾25次，平均每10．72年发生一次。从时间分布上看，清代关中地区蝗灾从清代早期到中期再到晚期，呈现由多变少再变多的特点，清代中期是蝗灾少发期，早期和晚期是蝗灾多发期。该地区蝗灾的发生主要集中在渭南地区。根据蝗灾的等级序列可以得出，清代关中地区二级一般蝗灾发生频次最多，其次为四级特大蝗灾，一级较弱和三级严重蝗灾发生频次较少。

英文摘要：

Through collection, arrangement and analysis of historical documents and materials, spatiotemporal characteristics,disaster grade and the cause of plague of locusts in the Guanzhong Region was researched for the Qing Dynasty. The results show that from A.D. 1644 to 1912 ,there were 25 times of plague of locusts during 268 years in the Guanzhong Region. It occurred once every 10.72 years. In regard to tomporal distribution, from early period to middle period and then to late period of Qing Dynasty, plague of locusts shows characters that it occurred from high frequency to low frequency in the Guanzhong Region. Middle period is low frequency time of locust disaster. Early period and late period are high frequency time of plague of locusts. The plague of locusts mainly happened and concentrated in Weinan District. According to grade sequence of the plague of locust, it is shown that the second grade happened most frequently and the fourth grade took the second place. The first and third grades happened scarcely.