Method for overwintering of orah trees

The invention discloses a method for overwintering of orah trees, and belongs to the technical field of agriculture. The method includes the following steps that 1, in one month before overwintering,overwintering fertilizer is applied to the orah trees, and the overwintering fertilizer includes, by weight, 50-90 parts of nitrogen fertilizer, 40-80 parts of monoammonium phosphate, 30-70 parts of potassium sulphate, 7-14 parts of sulfur, 10-30 parts of borax, 1-15 parts of zinc sulfate, 15-35 parts of ferrous sulfate, 5-15 parts of manganous sulfate and 1-3 parts of ammonium molybdate; 2, in one week before overwintering, deep trenches of 80-110 cm are dug in the outer sides of water drips of crowns of the orah trees to discharge accumulated water in a field; 3, in one week before overwintering, the crowns of the orah trees are trimmed into spheres and wrapped by transparent films from top to bottom, the interiors of the transparent films are filled with air, the lower ends of the transparent films are tightene