The slope farmland is the important land resource.Nowadays,much of them have degraded and lead to low land productivity for the reasons of incorrect management.A few effective methods are summarized in the past studies.The main aim of managing the slope farmland in the engineering of converting farmland into forest is to adjust the structure of countryside economics,and to realize the double wins in the ecological environment and economics under the better controlling of soil erosion and water run off.This article summarizes the basic theory,technology and existent problems of the engineering of converting farmland into forest.