Abstract: The large area low-function forests restrain the sustainable development of forestry sector.This paper introduced the definition of low-function forest and analyzed its driving factors including natural factors and human disturbance.By classifying Low-function forests as low-function shelter forest and low-quality and low-yield forest, the paper proposed a series of evaluation critera for low-function forests and discussed the methods to improve low-function forests, including additional planting and sowing, adjustment of stand structure for improvement, hill closure for improvement, strip reconstruction and so on.Some primary problems in low-function forest improvement were finally presented.