In order to reveal the genetic law of walnut leaf traits, so as to provide the basis for early trait selection of hybrid offspring, the leaf traits such as leaf length, leaf width, leaf area, leaf index and specific leaf weight of 374 strains in two reciprocal crosses which were 7-year-old seedling tree were investigated. The results showed that the variation coefficients of each traits were more than 6%; the highest variation coefficient was specific leaf weight, which was more than 15%; in the 4 cross combinations, the inheritance of transfer ability of leaf index was more than 100%; compared with the other three traits, the broad-sense heritability of leaf width and leaf index was the highest, both more than 79; the frequency distribution of leaf area was continuous variation. The leaf areas in different cross combinations reciprocal offspring were mainly concentrated 55~60 cm2; the proportions of small leaf, middle leaf and large leaf types in the hybrid offspring were 13%~15%, 74%~80% and less than 10% respectively; in the reciprocal cross offspring combinations of ‘Lvling’ and ‘LiaoningNO.1’, leaf length, leaf width, leaf area, leaf index and specific leaf weight respectively were 12.52 cm, 6.72 cm, 55.27 cm2, 1.88,53.18 g/m2and 12.86 cm, 6.71 cm, 56.43 cm2, 1.91,59.09 g/m2; leaf area and specific leaf weight of inverse cross offspring were very significant higher than those of obverse cross offspring; in the obverse cross and inverse cross combinations of ‘Lvling’ and ‘Lvzao’, the value of each trait were 12.63 cm, 6.73 cm, 57.25 cm2, 1.94, 63.54 g/m2and 12.58 cm, 6.80 cm, 57.59 cm2, 1.88, 62.28 g/m2respectively. There were no significant differences among leaf length, leaf width, leaf area and specific leaf weight of reciprocal crosses; the leaf index of obverse cross offspring was significant higher than that of inverse cross offspring.