It is usually issued in December. The purpose of returning farmland to forest is to protect and improve the ecological environment, to stop cultivation of sloping farmland that is prone to water and soil erosion in a planned and step-by-step manner, and to plant trees according to local conditions and restore forest vegetation in accordance with the principle of suitable land and suitable trees. The construction of the project of returning farmland to forests includes two aspects: First, converting sloping farmland into forests. Second, it is suitable for afforestation of barren hills and wastelands.