中文摘要：

以四川金堂、汉源和石棉3个县的核桃种质资源圃的97份核桃坚果为研究对象,考察腹径、横径、果高、三径平均值、果形指数、单果重、仁重、出仁率、壳厚、粗脂肪和粗蛋白等11个主要数量性状。结果表明：四川核桃遗传多样性极其丰富,坚果性状的变异系数变幅为9.92%~32.94%;仁重、单果重、粗蛋白和壳厚具有相对较高的变异系数,可作为核桃良种选育的重要参考指标;K–S检验结果表明,11个数量性状的Sig值均大于0.05,符合正态分布。对符合正态分布的数量性状用（X-1.281 8S）、（X-0.524 6S）、（X-0.524 6S）、（X-1.281 8 S）4个点分级,1~5级出现的频率分别为10%、20%、40%、20%、10%,符合正态分布。

英文摘要：

97 walnut germplasm resources from 3 counties of Sichuan province were used as materials, 11 main quantitative characters of walnut were studied to establish the probability grading standards of walnuts and index system on traits evaluation, the results were as follows： The genetic diversity of walnut in Sichuan showed abundance, and the range of variation coefficients of nut characters was from 9.92% to 32.94%. The characters of nut weight, kernel weight, protein content and shell thickness havehigher variation coefficient and could be used as important reference index for walnut breeding; The 11 quantitative characteristics showed a normal distribution with analyzing of K-S and were divided into 5 grades by dividing points of （X-1.281 8S）, （X-0.524 6S）, （X＋0.524 6S） and（X＋1.281 8S）. Occurrence frequency of 1 to 5 grades was 10%, 20%, 40%, 20% and 10%, respectively.