Abstract: Potato planting in Inner- Mongolia is threatened by cold injury including late spring coldness and early autumn frost, especially heavy frost in autumn always results in a substantial loss of potato yield. Thus, improve potato’s frost resistance is meaning for the potato industry development in Inner Mongolia. Out of the view of nutrient management, research was on the relationship between mineral elements content of potato leaf and leaf area index and potato plant’s frost resistance here. Result shows that, Both Nitrogen, phosphorus, potassium and potato leaf area index has a close relationship with frost resistance, of them, the correlation of change of leaf area index under nitrogen treatment and frost damage score is the most significant date, and its coefficient is 0.948, the effect of change of leaf area index on the frost damage score is 1.6, also the highest value among all treatments.