To clarify the nodulation characteristic of peanut in maize‖peanut intercropping system of semi-arid area in westLiaoning，a micro plot field experiment was conducted at Fuxin Science Observation Research Stations of Agricultural Environmentand Cultivated LandConservation，including the treatments of different planting patterns(solemaize，sole peanut andmaize‖peanutintercropping)and different N amount(0，100 and 200 kg/hm²). The results showed that the nodule number of peanut significantly increased in all growth stages by maize‖peanut intercropping system. The increasing range of N0 treatment was1.79 times，and average increasing range of N1 and N2 was 4.81 times，which indicated that the intercropping system promotedthe nodulation ofpeanut，especially in the condition of N applying. What ’s more，there was a border effect in the maize‖peanutintercropping，which showed the nodule number of peanut close to maize row was more than that of peanut far from the maize. Inaddition，as the N amountincreased，the nodulation of peanut was inhibited.Besides，there was alleviatory effect on the inhibitory effect of N fertilization on the nodulation of peanut intercropped with maize.