The needs of orange trees for various nutrient elements should be fully met, and it is suggested to apply more organic fertilizers, reasonably apply inorganic fertilizers and formulated fertilizers. According to the results of leaf analysis, orchard soil analysis and orange phenology, fertilization is guided. Mainly based on soil fertilization, combined with foliar fertilization. Methods such as annular furrow application, strip furrow application, hole application and soil surface fertilization were adopted. 1, organic fertilizer, guarantee the quality in citrus fertilization, organic fertilizer is necessary, but also the guarantee of product quality, especially in some citrus orchards reclaimed in paddy fields, if organic fertilizer is not applied, root problems will soon appear. In the application of organic fertilizer, we suggest that it should be used when applying winter fertilizer or spring fertilizer. Organic fertilizer can be commercial organic fertilizer or farmyard manure. It should be noted that farmyard manure must be used after decomposition. Now, many fruit farmers make peanut bran water and apply it to citrus, and the effect is very good. 2, compound fertilizer, high cost-effective compound fertilizer is also used in citrus planting. Generally speaking, we can apply high-nitrogen compound fertilizer to young trees, and fruit trees can be buried in winter, and high-nitrogen compound fertilizer can be added to supplement the nutritional consumption at flowering stage after flowering, and high-potassium compound fertilizer can be added to promote expansion and color change and sweetness during orange expansion. The cost performance of compound fertilizer is high, but it is necessary to pay attention to the application method. It is not recommended to spread it on the soil surface, and it can be ditched and buried. With the popularization of drip irrigation and other equipment, more and more water-soluble fertilizers are used. In the use of water-soluble fertilizers, the absorption efficiency is high, and the medium and trace elements needed by citrus can be supplemented in real time. At present, there are humic acid-containing water-soluble fertilizers, amino acid-containing water-soluble fertilizers, seaweed fertilizers, etc. These fertilizers are used more and more in citrus cultivation. These fertilizers are considered to contain "biostimulants", which means that there are also sea elves biostimulants. Generally speaking, these fertilizers are not only effective, but also helpful for repairing citrus root system and improving quality. It lasts until the fruit gradually turns yellow and is ready for picking. After picking, stop using fertilizer with high potassium content, which is what we call high potassium fertilizer. The frequency of fertilization is only 2~3 times a month. When the fruit is ripe in autumn, after picking it, it is necessary to supplement it with multi-element fertilizers and balanced nutrients, so that all elements are not missing, which can make its roots grow again quickly and then grow new branches, which can quickly age and become tough, and increase its ability to resist cold in winter. Until winter, we don't want to fertilize it. In winter, the temperature is low, and it is in a dormant state. To ensure that the basin soil is slightly moist, we can spend the winter safely.