In the past, navel orange seedlings were mostly cultivated with small rootstocks for half a year, and the seedlings came out of the nursery for half a year. Because navel orange seedlings are small, fertilizer and water management can't keep up after planting in the mountains. Many seedlings only survive without planting trees, and some become "small old trees" prematurely, which seriously affects the development of navel orange industry. Now the original small seedling grafting is changed to big seedling grafting, that is, one year rootstock and one year big seedling are carried out. The standard of first-class seedlings is that the plant height is above 50cm, the thickness is above 0.9cm, there are 2-3 branches, the root system is developed, the leaf color is dark green, and there is no gap between quarantine pests and serious pests. Following the seeds with nutrition bags and planting big seedlings in the mountains can achieve high survival rate, fast growth, early garden formation and good garden appearance, shorten the young age and get benefits in advance, thus stimulating the enthusiasm of fruit farmers to develop the fruit industry.