Abstract: The reasonability of interplanting of fruit trees (pear and peach) with crops (wheat + corn, soja bean, millet) was studied and analysed based on the utilization effect of light, fertilizer and water. In the field, which was manured in common amount and watered 3 times in period of spring, the fruit trees didn’t compete significantly with the crops in utilizing light,fertilizer and water,and the utilization rate of water was increased. The economic benefit analysed by the method of LER (land eguivalent ration) indicated that the LER value was 1.20-1.32.Therefore,in the regions which have irrigation condition, the interplanting pattern of the fruit trees with the crops is a reasonable planting model which can combine the economic, ecological and social benefits.

Key words: Fruit trees-crops interplanting, Utilization of light, fertilizer and water, Yield effect