Abstract: 【Objective】 This Project aims to study the effects of root application of N P and K fertilizer on the nutritional quality of hazel nut in the hope of providing scientific basis for improving the nutritional quality of nut in the future production. 【Method】 The effects of fertilization on nut crude fat and crude protein content was analyzed by using multi linear stepwise regression based on"3414" field fertilizer effect test. 【Result】 Under the condition of medium soil nutrient, there was a significant positive effect between the crude fat content (E) ofCorylus heterophylla×Corylus avellana nut and the amount of N fertilizer (pure N) (P < 0.001), and the interaction between N fertilizer and K fertilizer had a significant negative effect of N × K (P < 0.001). When the fertilizing amount of P fertilizer (pure P₂O₅ amount) was less than 0.238,7 kg per tree,there was a positive effect on the common logarithm of crude protein content of nut, vise versa, there was a negative effect on the crude protein content of nut when applying K fertilizer (P< 0.001). The interaction between N fertilizer and P fertilizer (N × P) had a significant positive effect on crude protein content of nut (P< 0.05). 【Conclusion】 Under the specific environment conditions of Xinjiang, root N fertilizer and P fertilizer can effectively improve the content of crude fat and crude protein in the fruit ofCorylus heterophylla×Corylus avellana.