Abstract: The study is concerned with some agroclimatological methods to compare with 10 climatic elements, which be taken from 7 weather stations of neighbouring county at north Jiangsu. It will be seen from this that shelterbelts produce a lot of good influences in ground-climate, in particular to represent a colding effect and a humidifying effect, which help to bring a good yield about food crops. However, shelterbelt system can't effect any variation of macroclimatic background if forest-cover rate in the place is existed as less than 20%.

Key words: Agroclimatological method, Forest-cover rate, Colding effect, Humidifying effect