Fertilizer application technology of corn mint in lime concretion black soil area was studied.The findings indicated that: When topdressing 138 kg/hm2 N in branching time of the corn mint,basal application of N fertilizer caused in corn mint plant over growing,and the corn mint leaf massively to fall in the harvest time.Then reduce pennyroyal output.K could remarkably enhance the corn mint output,and in low K amount used,the increase effect of potassium chloride was near to potassium sulfate.But in high potassium rate used,the potassium sulfate effect was better than potassium chloride.Considering reduction of the cost and increase of the output,combined application of the potassium sulfate and the potassium chloride coordination may obtain a more ideal effect. P had little effect on the corn mint growth and yield,and excessive P had affected corn mint growth.