根据渭北旱塬农业生产和夏闲地现状，论证了渭北旱塬扩大复种开发夏闲地的必要性和可能性，并通过试验研究表明，虽然水分不足是扩大复种的主要限制因素，但只要因地制宜也可适度开发夏闲地（从三年四熟到一年二熟）。 According to the status quo of agricultural production and summer fallow in Weibei Arid Plateau, the necessity and possibility of expanding the summer fallow land for multiple cropping in Weibei Arid Highland are demonstrated. Though the lack of water is the main limiting factor for expanding multiple cropping, As long as the local conditions can also be moderately developed summer fallow (from four to four years of cooked twice a year).