Historical documents provide many important data for the reconstruction of historical climate Among these documents, ancient diaries are important and contain plenty of climatic information undiscovered This paper studies the climatic information in the Weizhai Diary written in the early 18th century in Wuyuan County,Jiangxi Province The information recorded in the diary includes daily weather record, phenological record, and other related climate record According to the records, the climate from 1700～1703 A.D. in Wuyuan, Jiangxi Province was reconstructedIt is found that the climate was drier than that of the driest year at present and the winter was warmer during the period