The invention provides a mountain land grafting method and a mountain land cultivation method of apocarya and belongs to the field of cultivation methods of walnuts. The mountain land grafting method comprises the following steps: selecting and treating stocks: selecting seedlings of the apocarya, which are 1 to 2 years old, as the stocks; planting the seedlings on a mountain land; enabling the seedlings to grow until the height is 60cm to 80cm and carrying out field planting for 2 to 3 years; carrying out top grafting and head change: top grafting pre-selected scions on main branches of the stocks and covering a top grafting part by a plastic film; cutting the plastic film after 3 days, so as to form a liquid drainage hole; carrying out one time of water drainage operation and closing the liquid drainage hole. According to the mountain land grafting method provided by the invention, water drainage is reduced after the top grafting and conventional operation is changed; the survival rate of the apocarya cultivated in the mountain land is improved; rapid forestation of the mountain land can be realized and occupation of a farmland is reduced, so that lands for cultivating cereals are not occupied. The mountain land cultivation method comprises the mountain land grafting method, so that the apocarya is cultivated on the mountain land and the occupation of the farmland is reduced.