Taking 8-year-old Juglans regia as material,the root distribution under intercropping were measured in field through section observation.The results showed that,there were many roots in the field.The number of absorbing roots were maximum which coarseness was less than 2 mm.The main roots distribute in soil layer from 10 cm to 60 cm.The number of roots in the soil layer from 20 cm to 40 cm was maxium.It reduced first then increased with the depth decreased.The number of roots reduced first then increased in horizontal directions.In order to slow down the competition of roots,the shallow rooted plant whose roots distributes in the 20 cm soil layer should be selected the intercrop,the management of fertilizer and water should be strengthened.