Study on the Inverse Relationship between farm's efficiency and farm size is always a hot topic in the agricultural economics. Using the farm-level micro panel data from Hubei province in 1999-2003, the paper, from the multi-perspectives of the land productivity and labor productivity etc. , discusses the relationship between farm's efficiency and farm size, and analyzes the effects of rural household endowments on the farm's efficiency. An o- verall look in a broader vision should be given to the hypothesis of the Inverse Relationship. Whet...