目的 为了研究水蜜桃大小与内在品质的相关性，探索合理的分级方法，为优质水蜜桃的分级、贮运生产提供理论依据。方法 以“玉露”水蜜桃为实验材料，测定单果质量、纵径、横径、可溶固形物含量、可滴定酸含量、固酸比等指标，并对各指标进行因子-聚类分析。结果 水蜜桃大小指标（单果质量、纵径、横径）与品质指标（可溶固形物含量、可滴定酸含量、固酸比）相关性不显著；通过因子分析提取了2个因子成分，其累计方差贡献率为78.401%，较好地代替原有指标来综合评价水蜜桃的品质，再通过聚类分析将桃分成4个等级，各等级桃果的品质指标均呈现梯度变化。结论 基于因子-聚类分析的水蜜桃方法能按照桃果的综合品质进行分级，符合生产实际和消费需求。

The work aims to study the correlation between the size and quality of juicy peach and explore a reasonable grading method, so as to provide theoretical basis for grading, storage, transportation and production of high-quality juicy peach. "Yulu" juicy peaches were used as test materials to measure the weight, transverse diameter, vertical diameter, total soluble solids (TSS), titratable acidity (TA) and TSS-TA ratio of single peach. Factor-Cluster analysis was carried out to these indexes. There was no significant correlation between size indexes (weight, vertical diameter and transverse diameter of single peach) and quality indexes (total soluble solids (TSS), titratable acidity (TA) and TSS-TA ratio). Two principal components were extracted through factor analysis and their cumulative variance contribution rate was 78.401%, thus comprehensively evaluating the quality of juicy peach instead of original indexes. The peaches were classified to 4 grades by cluster analysis and the quality indexes of peach fruits of all grades showed gradient changes. Factor-Cluster Analysis is a reasonable grading method for Juicy peach, which conforms to the actual production and consumption demand.