There is real rain-feed agriculture in west semidry region of Jilin province. This paper taking Zhenlai county as an exampe, has analysed. rain-feed case of cultivated crop in west semi-dry region of Jilin province The result showed that rain-feed level for cultivated crop was very poor, and seriously absence of precipitation, limiting farmland yield potential in this region. To stable the crop production, it is necessary to develop water supplement agriculture.