Taking new agricultural business subject of the national rural experimental site as research objective and a number of Probit models as the main research methods, this paper makes analysis on the factors and the relationship affecting the demand and availability of mortgage loan on the basis of right to contract for management. The research result shows that as far as mortgage loan of contract for the managerial right of farmland is concerned, at present there is a small range of equilibrium between interior microcosmic structural malposition and external macroscopic balance of supply and demand. Both demand and availability are affected by the educational level of operator, family annual income and scale of farmland. The balance between demand and availability can be further realized from these three aspects. Based on the idea of the structural reform of the supply side, this paper puts forward some pertinent policy suggestions for the experimental reform of management right mortgage.