In order to select the early-fruiting walnut varieties(strains) suitable for cultivation at mountain area of Western Hubei,15 walnut varieties(strains) were introduced in 2 times,two comparative experimental forest were built at the altitude of 1 200 m and 145 m in Yichang,respectively.Some main indexes in the 15 walnut varieties(strains) and native thin-shell walnut were investigated f rom 2005 to 2007,including nut mass,mean value of three diameters,shell thickness,kernel percentage,kernel-taking index,co...