84 soil samples of main citrus producing areas were collected to explore the soil nutrient deficiencies and excessesin citrus orchards in Hunanprovince，and provided theoretical basis for scientific fertilization management by measuring itspH，organic matter and mineral nutrients.The correlation between soil pH and soil fertility was analyzed by group regressionmethod.The results showed that the soil organic matter and alkali N content in Hunan province were suitable，while thesoil acidification of citrus orchards was serious and 1/3 of them had low levels of available P and availableK.The ratio ofexchangeable Ca and Mg deficiency was 43.75% and56.25%，respectively，and the excess ratios of availableS，Fe，Mnand Cu were69.88%，87.50%，65.63% and64.06%，respectively.The effective Zn content suitable ratio was76.56%，and the effective B deficiency ratio was85.94%.The relationship between soil pH and exchangeable Ca and Mg content weresignificant positive correlated，while it showed an extremely significant negative correlation with organic matter，availableP and available S content and a significant negative correlation with effective Fecontent.There was a significant differencebetween nutrient content and soil pH groups.It is calculated from the curve regression equation that when the pH value of the citrus orchard is 5.6～6.3，the mineral nutrient content in the soil is quitehigh.To adjust the pH value of thesoil，control the application amount ofN，P and Kfertilizers，and supplementCa，Mg and B fertilizers are the key points for the management of fertilization in the future.