以薄壳山核桃为父本，山核桃为母本，进行种间杂交，对F1代果实及苗木主要性状进行测定，结果表明：杂交F1代果实与果核（种子）的大小、质量以及苗木的高、径生长与对照之间都存在显著水平或极显著水平的差异。其中单果质量、果高、果径分别比对照高291 %、72 %、110 %；单核质量、核高、核径分别比对照高309 %、813 %、124 %；3年生苗木平均高和地径比对照分别高181 %和197 %；造林2 a后苗木平均高和平均地径比对照分别高292 %和3281 %。另外，杂交F1代双胚苗所占比率为10 %，是对照的5倍。研究表明，种间杂交对增大山核桃果体、改良山核桃性状是有意义的。

The main characters of fruits and seedlings of F1 obtained by hybridization between male parent Corya illinoensis and female parent Carya cathayensis were examined. The results showed that characters of F1 were significantly different from that of control in terms of weight and size of fruit and seed, height and diameter of seedlings growth. The weight, height and diameter of fruits were higher than the control by 291 %, 72 %, 110 %, respectively. And the weight, height and diameter of seed were higher than the control by 309 %，813 %，124 %, respectively. The average height and diameter of 3 years old seedlings were higher than the control by 181 % and 197 %. And it could achieve 292 % and 3281 % after having planted for 2 years. Therefore, It was effective to increase fruit size and improve characters through interspecific hybridization. Seedlings with double embryos in F1 generation accounted for 10 % which was 5 times higher than the control.