By means of analyzing the relationship among fixed cost, variable cost and the scale of property management, using the break even analysis to deliberate the least scale of property management with no loss.

Breakeven Analysis on Investment Item Under the Undeterminate Conditions;

Nonlinear breakeven analysis can be used to derivethe lower economic limit rate of waterflooding oilfields,while Hubbert model and LpLp/Np correlation to determine the relationship between time and oil output and that between fluid production and water cut.

The gain or lose is an important standard to judge the economic benefit of firms,and break-even analysis,namely Volume-Cost-Benefit Analysis,is a valuable method for firms to well know its production and sale and consequently to provide a base to reach a decision about future production and sale.

This paper combines econometric models with emphasis on the cubic polynomial model of the cost and added a more close to reality form of revenue function as r(x)=qxk,on the basis of this paper,mentioned a general procedures to resolve any break-even analysis,concluding omissions of previous scholars of non-linear break-even situation.