Abstract: For achieving the recommended fertilization to the rainfed potato in Guyang County,the 17 items dry farming potato soil-test-fertilization of ＇3414＇ farming experiments were summarized and analyzed.The results showed that the fertilization increasing effects order was N〉P〉K.N fertilizer had the best effect,then the P and K fertilizer.Although the soil has higher K content,K fertilizer has better significant synergies for soil.The results proved that N fertilizer was the most significant nutritive factor which make effects to rainfed potato production at north of Yin mountain.Furthermore,with fertilizing amount increased the fertilizing use rate and agronomic efficiency reduced at 3 fertilizer gradients.On average,to increase 13.1kg potato yield need 1 kg N fertilizer;1kg P2O5 for 24.2kg potato;1kg K2O for 21.3kg potato.According to the NPK fertilizer experiment of fertilizer effect equation,the soil productivity of rainfed potato were lower than 400kg/667m^2,between 400-600kg/667m^2 and 600-800kg/667m^2, and higher than 800kg/667m^2, respectively.These research results could give the recommended fertilization to rainfed potato in Guyang County.