Citrus was the fruitcrop with the largest planting area and the highest total yield in China.In the past 20 years，the degree of intensification in China had been continuously improved，anda number ofcitrus planting enterprises with large planting scaleand high degree of standardization have emerged，but there was stilla lack of special fertilizer for the development of large-scalecitrus planting enterprises.Therefore，this study took Chu orangeasan example，on thebasis ofanalyzing the nutrient input of the enterprise，combined with the climatic characteristics，site conditions and citrus nutrient requirements of thearea where the enterprise was located，formedan enterprise-levelcitrus special fertilizer formulaand entrusted the production ofadvantageous enterprises，and thencarried out experiments and demonstration verification in different operationareas of the enterprise.The results showed thatbased on the fertilization experience of Chu orange，two special fertilizer packages for citrus containing potassium fulvicacid(winter fertilizer with 15-8-10-TEs and summer fertilizer with 14-5-15-TEs)were created.Under the experimental conditions of dryand hot valley in Yunnan，compared with the conventional fertilization(FP)of Chu orange，the root length density of acylammonium citrus(CSF1)and ammonium nitrate citrus fertilizer(CSF2)increased by 21.7% onaverage，the yield increasedby 14.8% onaverage，and the solid-acid ratio of rock sugar orange increasedby 3 units onaverage.At the same time，the averagecost of fertilizer was reducedby 3647 Yuan/hm²，and the ratio of fertilizer production and investment increasedby 9-32 units.The demonstration of multiple operationareas(5)further showed that the yield ofcitrus special fertilizer package(CSF2)increasedby 10.8 t/hm² by an average of 24.2%，compared with thecontrol，and the fruit quality was comparable.In summary，based on the fertilization experience of large-scale citrus production enterprises，combined withclimate，site conditionsand variety characteristics，special fertilizers forcitrus planting enterprises could be developed.Stable yieldand high quality，fertilizer reduction and efficiency increase，and cost saving and income increase could be synergistically achieved，which could provide new ways and technical supports for the green and sustainable development of China’s citrus industry.