Historical documents provide many important data for the reconstruction of historical climate Among these documents, ancient diaries are important and contain plenty of climatic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 reconstructedIt is found that the climate was drier than that of the driest year at present and the winter was warmer during the period