Abstract: In order to provide the necessary realistic basis for research of special forest fruits efficient water use, walnut was chosen as research object in this investigation. Walnut trees irrigation status investigation was carried on a household basis in Bayingolin Mongol Autonomous Prefecture, Hetian Region, Kassgar Region and Aksu Region. The results showed that:(1) total planting area of walnut trees in investigation region was 2.72×105 hm², which was 97.20% of that in Xinjiang; (2) there were two cultivation patterns of walnut trees: planting under monoculture condition and planting under intercropping condition; (3) flooding and border irrigation were main irrigation methods of walnut trees, pipe irrigation with low pressure, bubble Irrigation and drip irrigation were developed gradually; (4) under surface irrigation condition irrigation requirement of walnut trees was 1200-3000 m³/hm² and irrigation 5-8 times every year, under micro-irrigation condition irrigation requirement of walnut trees was 150-600 m³/hm² and irrigation 10-30 times every year; (5) under different irrigation conditions irrigation water use efficiency of walnut tree changed from 0.05 kg/m³ to 0.54 kg/m³, with scientific management walnut trees could get high yield under different irrigation conditions.