Abstract: The purpose of experiment was to supply the recommended fertilization to the irrigation potato in Guyang county.In addition,to analysis and summary the 17 items irrigation potato soil-test-fertilization of ＇3414＇ farming experiment in Guyang county.The results have been shown as the fertilization increasing effects order was N K P.N fertilizer has the best effect,then the P and K fertilizer.Not only the general soil has higher K content,but also K fertilizer has better significant synergies for soil.It could prove that N fertilizer was the most significant nutritive factor which make effects to irrigation potato production at north of Yin mountain. Furthermore,increasing fertilizing amount could lead to the reduction of fertilizing use rate and agronomic efficiency from 3 fertilizer gradients.To analysis the data,1kg N could increases 22.4kg potato production;1kg P2O5 could increase 37.8kg potato production;1kg K2 O could increase 33.7kg potato production.According to the NPK fertilizer experiment of fertilizer effect equation, the perfect N,P and K usage dosages recommended of recommended fertilization has been follow the different fertility of potato production which are lower than 1000kg/667m2,between 1000 ~1500kg/667m2 and 1500 ~2000kg/667m2,and higher than 2000kg/667m2.These research results could give the recommended fertilization to irrigation potato in Guyang County.