Abstract: As a part of the Nationanl Key Science and Technology Project,comprehensive analyses of agro-forestry complex ecosystem had been carried out in Raoyang Experimental Area of Huanhuaihai Plain.The results of the experiment show that the ecological environment has been improved owing to the establishment of agro-forestry complex ecosystem.The sandy,windy,dry,poor soil and low crop yield area has been changed into an environmentally sound area with high yield.The complex ecosystem improved the local climate,reduced the CO₂ and dust concentrates of the air and increaased the number of birds in this area.The forest coverage of the area had been increased from 2% to 20% and the crop yield had been increased from 1500 kg/hm² to 7500 kg/hm².The area has become a demonstration area for integrated management in low and medium yield areas of Huanghuaihai Plain.

Key words: Hebei, Huanghuaihai, agro-forestry, ecosystem, ecological environment