Soil nutrients are always the most direct and main source of nutrients for citrus trees. The level of soil nutrient content directly determines the nutrient accumulation and storage of trees， which is the basis of tree nutrition. The lack of soil nutrients will inevitably lead to the lack of tree nutrients. This article summarizes the relationship between leaf analysis and soil analysis in citrus orchards to diagnose nutrient status， soil and its fertility "deficiency" factors in Chinese citrus orchards. It is defined that the deficiency of calcium， magnesium， boron and zinc in citrus， soil acidification and excess of phosphorus， iron， manganese and copper are the prominent problems of tree nutrition in Chinese citrus orchards. The joint diagnosis of nutrient status in citrus orchards by leaf-soil analysis， as well as the ecological region division of soil based supplementary fertilization and decrement fertilization in Chinese citrus orchards were proposed. It will be of great significance to guide the fertilization and production of citrus with low-carbon and green and high efficiency in China..