We used Corylus heterophylla Fisch., C. mandshurica Maxim. et Rupr. and 25 C. heterophylla Fisch. × C. avellana L. strains with good growth, resistance and yield as materials to analyze the appearance quality. 17 appearance quality indexes such as nut length, nut width, nut weight, kernel weight, shell thickness, kernel percent, shell weight, shape index, elongation, arithmetic mean diameter, geometric mean diameter, sphericity, aspect ratio, surface area, volume, filling index were measured and analyzed. The appearance quality characteristics of the hazelnut strains were comprehensively evaluated by means of analysis of variance, correlation analysis, cluster analysis and principal component analysis. The analysis of nut quality is of great significance for the cultivation and screening of hazelnut strains, and which provides a scientific basis for the variety selection, development, processing and utilization of domestic strains of hazelnut. The results showed that: (1) the differences in 17 appearance quality indexes of different hazelnut strains showed significant levels. There were obvious differences in shell weight, volume and nut weight, variability coefficient of which were 31.49%, 30.44%, 27.50%, respectively. The variability coefficients of aspect ratio, shape index, elongation, sphericity were below 10%. (2) The nut length, width, thickness, nut weight, kernel weight, kernel percent of C. heterophylla Fisch. × C. avellana L. strains were better than that of C. heterophylla Fisch., C. mandshurica Maxim. et Rupr. The kernel weight and kernel percent of C. heterophylla Fisch. × C. avellana L. strains were 0.70-1.46 g, 31.48%-56.12%, respectively, which were significantly higher than that of C. heterophylla Fisch. (0.51 g and 35.13%), C. mandshurica Maxim. et Rupr. (0.37 g and 38.12%). (3) Results of correlation analysis showed that the larger the volume of nut, the greater its nut weight and the kernel weight. The thinner the shell, the higher the kernel percent. (4) Principal component analysis showed that the main indexes affecting the comprehensive score of nuts were length, width, thickness, nut weight, kernel weight, followed by shape index, aspect ratio, percent kernel and filling index. According to the comprehensive scores, the comprehensive characters of nuts of 81-7, U3, 85-28, Liaozhen 9, U2, Dawei, Liaozhen 2 and Liaozhen 3 were better.