Abstract: Take the high potassium efficiency potatoes HKE-1 and HKE-2 which had been culled out by our research group in the potato breeds as the materials, carries on the interplanting experiment with the soybean, the potato/corn interplanting, the potato, the soybean, the corn as the comparison, researched the benefit situation which potato and soybean in the ratio under 2:1 and 2:2 cultivation pattern. Through to each kind of cultivation pattern under the benefit analysis, indicated finally: The potato/bean is an good expert under 2:1 cultivation pattern economic efficiency, the potato/bean of HKE-1 interplanting net-income is 2546.79 Yuan /667m2, the potato/bean of HKE-2 interplanting net-incomes is highest, is 2678.11 Yuan /667m2, it suitable to be extended.