Abstract: The study on the rotate cropping of potato and green manure was carried out in the dry land in the North foot of Yinshan Mountain.The results showed that the yield of hairy vetch and common vetch were increased by 13%-36.0% after applying N and P fertilizer and the effect was larger on the common vetch yield.The residual effect of balanced fertilizer on the potato yield is as good as in the treatment of applying DAP in the green manure.The effect of green manure on the yield of potato was not obvious.When the N fertilizer application was deceased 30% the yield of potato was not decreased significantly.So the N fertilizer applying can be decreased by 30% after green manure cropping.