To explore the suitable planting distance for peanut intercropped in walnut grove, the experiment used Jinhua 10 and Huayu 33 as materials to study the differences of growth, dry matter accumulation,photosynthesis property and yield of peanut in different rows under the condition of peanut intercropped in walnut grove.The results showed the growth,dry matter accumulation,leaf area index(LAI) and yield of peanut in different rows were obviously different when the planting distance between peanut and 6-year-old walnut trunk was below 90 cm.As the increase of the distance, the growth advantage was significant.The growth,dry matter accumulation,LAI and yield of peanut in different rows showed no obvious difference when the planting rows were above 90 cm away from the trunk.Compared with the treatments with planting rows 30 cm,60 cm away from the trunk,the average theoretical yields of the three treatments of Jinhua 10,Huayu 33 with planting rows 90 cm,120 cm and 150 cm away from the trunk were respectively increased by 34.43% and 16.07%, 24.36% and 14.60%.Therefore, the optimum intercropping distance of peanut was 90 cm from the trunk of 6-year-old walnut.