Late-ripening mango is an important pillar industry in Panzhihua city，Sichuan province.However，due to the large application of chemical fertilizer and little application of organic fertilizer production in recent years，the soil fertility of orchard is degraded and the acidification phenomenon is serious，and mango quality is decreased.Application of organic fertilizer can reduce the amount of chemical fertilizer and improve soil fertility，but the effect of different nutrient types of organic fertilizer on mango quality and soil fertility is still not clear.On the basis of the previous research and investigation，three mango orchards with different fertility levels were selected according to the soil characteristics of Panzhihua late-maturing mango orchard.Through three years of field experiments，the effects of applying organic fertilizers with different carbon and nitrogen ratio ratios and optimizing fertilization techniques on the improvement of mango yield，quality and soil fertility were explored.The results showed that:(1)The yield and quality of mango with organic fertilizer application were significantly higher than those of inorganic and non-fertilization treatments.Under the same nitrogen application，the yield of chicken manure and animal amino acid organic fertilizer treatment was significantly increased by 19.4%，compared with that of straw and stevia organic fertilizer with high carbon and nitrogen ratio ratio treatment.Stevia organic fertilizer with the highest carbon and nitrogen ratio ratio significantly improved mango quality，increased sugar content by 6.0%，acidity by 30.3% and reducing Vc content by 18.8%，compared with the other four organic fertilizers.(2)Three years of continuous application of organic fertilizer increased the average yield of low，medium and high fertility orchards，the low fertility orchards with the highest total nutrient were significantly increased under chicken manure organic fertilizer treatment，and the middle fertility orchards with animal amino acid organic fertilizer treatment were significantly increased，but there was no significant difference in yield among different types of organic fertilizer in high fertility orchards.(3)From the analysis of principal component comprehensive score，stevia organic fertilizer treatment with the highest carbon and nitrogen ratio ratio had the highest comprehensive score of soil fertility，followed by animal amino acids and chicken manure，and straw and cow manure treatments had the lowest score.According to the mango yield，quality，soil fertility and other factors，the best yield treatment of late-ripening Kat mangoes in west Panzhihua region was chicken manure and animal amino acid organic fertilizer，and the best quality treatment was stevia organic fertilizer.All the five types of organic fertilizer could improve soil fertility，and the improvement ability was stevia>animal amino acid>chicken manure>straw>cow manure.For different fertility orchards，low fertility orchards are suitable for chicken manure organic fertilizer with high nutrient content，medium fertility orchards are suitable for animal amino acid organic fertilizer，and high fertility orchards are suitable for all five kinds of organic fertilizer，which can be considered comprehensively from the angle of organic fertilizer price and soil fertility improvement.