Based upon the climatic data in Poyang Lake area in the last 30 years, the changes of climatic elements, due to large-scale reclamation, have been observed both In reclaimed area and lake district. Detailed analysis and comparisons between them before and after reclamation are given from the fallowing six aspects:(1) the yearly-mean air temperature has ascended 0.11℃ in the reclaimed area and 0.09 UC in the lake district; (2) the maximum air temperature average 0.57℃ higher per year in the reclaimed area, and also 0.07℃ higher in lake district; (3) Concerning the days when the annual temperature exceeds 35℃, an increase of 10 days and 4 days is noted in the reclaimed area and the lake district, respectively; (4) in the reclaimed area, the yearly-mean minimum air temperature decreased 0.28℃ while In the lake district increased 0.06℃; (5) the vapor pressures have dropped by 0.05 hPa in the reclaimed area and 0.16 hPa in the lake district; the relative humidity also drops 1% in both areas; (6) the corresponding yearly-mean precipitation has decreased by 95mm in the reclaimed area> whereas no distinct change was observed in the whole lake district.