Abstract: 【Objective】 To find out problem in soil nutrient of apple orchard and obtain the theory basis for targeting reasonable balanced fertilization and increasing utilization ratio of fertilizer nutrient, effect nutritive element content in soil on fruit qualities and optimum quantity of nutrient elements for good fruit qualities were explored.【Method】The investigations were carried out soil nutrient and fruit qualities, and methods of Canonical Correlation Analysis and linear program were used to screen major soil nutrient elements affecting fruit qualities, to solve optimum proposal of nutrient elements for good apple qualities, to point out existing problem of soil nutrient in survey apple orchard.【Result】Soil organic matter, available P,K, fruit firmness and soluble solids content in apple orchard of Changping district were higher than that of Shandong, Shaanxi and Gansu province. The soil organic matter was positive correlation with total N, available P, K and microelement,　and correlation coefficient was 0.8261 between alkeline-N and available Zn. The fruit mass were positive correlation with soil organic matter, alkeline-N, available P, K, and negative correlation with available Fe, Zn and B. The fruit firmness were positive correlation with soil organic matter, Alkeline-N, and negative correlation with available P and K. The soluble solids content were positive correlation soil organic matter, available K and Ca. The optimum proposal of nutrient elements content in soil was obtained by linear program resolution that were 10.0～40.0 g.kg-1 in organic matter, 0.50 g.kg-1 in total N, and 400 mg.kg-1, 254.47～400.0 mg.kg-1, 600.0 mg.kg-1, 5.00 mg.kg-1, 5.00～60.00 mg.kg-1, 0.80～20.0 mg.kg-1, 0.5 mg.kg-1 in alkeline-N, available P, K, Ca, ?Fe, Zn, and B respectively. Under this optimum proposal of soil , the target of fruit qualities in 350.66 g mass, 12.16 kg.cm-2 firmness, 23.19％ soluble solids, 0.377％ titratable acid will be achieved theoretically. The results indicate more than 50% soil samples were deficient in available P, and 91.18％, many orchards deficient element Fe and Zn respectively in investigation orchard . 【Conclusion】It is key point to improve alkeline-N , available P, K and Fe,Zn content in soil in apple orchard of Beijing Changping.

Key words: Apple, Soil nutrient contents, Fruit qualities , Multivariate analysis, Optimum proposal