Itives an impo rtant contentof environment construction to enpedite sustainable use of soil and water re-sources in the mountain area of conversion from farmland to forest.Based on analy ses of P.Kansuensis adaptabili-ty,popularizing value and advantage of water and soil resources in the mount ain area of conversion from farmland to forest,a newexploiting method w hich taked cultivating P.Kansuensis as a dominant factor was put forward.the manag ing effect and managing benefitof cultivating P.Kansuensis in the mountain area of conversion from farmland to forest were analyzed.