Abstract: Using different dosage gradient test of micronutrient fertilizer, the effect of micronutrient fertilizer on potato yield and agronomic traits was studied, the results showed that with the micronutrient fertilizer dosage increased, potato number of per plant, big potato number of per plant, yield of per plant, yield of 667m2 were all increased, when micronutrient fertilizer dosage of 600 g/600 m2, the above index all reached maximum; increased more micronutrient fertilizer dosage, the all parameter values were showed declined trend.