Abstract: In recent years, protected agriculture has developed rapidly and improved the utilization efficiency of agricultural resources greatly. By introducing the concept of Land Equivalent Ratio(LER), this paper compares protected agriculture with open agriculture, sets up three indexes to evaluate the utilization degree of protected agricultural resources: Yield Equivalent Ratio (YER), Equivalent Ratio of Production Value(ERPV), Equivalent Ratio of Net Income(ERNI) and constructs their computing modes. On the basis of these, using the protected agriculture of planting vegetable in Quzhou county in Hebei province as the convenient sample, the paper investigates the planting status of protected agriculture and open agriculture by "twin" method, then calculates YER, ERPV and ERNI, and analyzes them by SPSS. It is found that resources utilization degree of protected agriculture is mostly in a low level in Quzhou county and the increase of protected agricultural resources utilization efficiency still has a great potential.