Irrigation schedule for walnut tree under drip irrigation was studied through a field experiment with orthogonal design method. Results showed that the total water amount was between 711. 77 and 814. 38mm for different lower limit treatments of soil moisture. In the growing period, daily water consumption for the treatments was 3. 57～4. 18mm/din April, 3. 78～4. 87mm/d in May, 5. 9～7. 35mm/d in June and July, being highest, and 3. 6～4. 46mm/d in August. Comprehensive analysis of yield, protein, fat and kernel rate showed that the lower limits of soil moisture were 60%, 60% and 50% in flowering stage, fruit expan-ding stage and stone hardening stage, respectively. Suitable irrigation was 12 times one year and the quota of irrigation was 680m³/hm².