Abstract: Effects and water-fertilizer production efficiency of compound fertilizers specified and traditional fertilizers were studied. The ratio of compound fertilizer specified and economic optimum fertilization were investigated through location research, the result showed that plant presented strong growth vigor , leaves were bottle-green, the average output per plant and commodity potato rate were increased with compound fertilizer specified under the same condition of fertilizing. Compared with traditional fertilizers, Plant yield increased 32.54%~46.28% under compound fertilizers specified for potato, and water use efficiency (WUE)increased 34%. Compared with traditional fertilizers, plant yield increased 14.9%~34.6% under compound fertilizers specified for potato in poor fertility site, and increased 33.5%-53.1% in middle fertility site.