Abstract: Using the best mixed plan，the experiment of 11 treatments show that the highest plot outputs of 1998，1999 and 2000 reach 12．92t／hm²．13．815t／hm² and 15．018t／hm²。respectively．343 plans are obtained through computer design，the best combination plan with yield of 15～17．625t／hm² is to use 60t／hm² of organic manure，462-483kg／hm² of N，to irrigate 600t／hm² of water before seeding，1377～1458t／hm²。of water in crop growth，to maintain the density of potato and sorghum with 72705～83415 plant／hm²。and 65205～75915 plant／hm² respectively．