Thus it is evident that the analysis of the ecological balance of profits and losses can function as the ecological early-warning for the regional sustainable development.

On basis of the summarizing research result both home and abroad, the method of break even point extending from static state to dynamic state is explored, and the calculation method of dynamic break even point is achieved.

In this paper, the principle of balance of profit and loss is applied to analyse the low-efficient oil wells with low residual oil saturability microscoically from the technical economic angle, and the range and horizon of distribut.

Based on the analysis of the operation mode of bidding,an economic analysis from the internal and external of electricity enterprise is made;by considering the power plants production cost and the profits of the power bidding,then analysis of balance of profit and loss is presented;and by using the analysis of enterprise profit maximization with the knowledge of marginal pricing,th.

On the basis of the models, the authors draw up a profit and loss balance chart ofproduction and management, make the profit and loss analysis and susceptibility analysisof profit and loss balance point.

Through studying the influences which time, price and interest rate posed on the development profit, the profit and loss balance circumstances of real-estate development were researched in depth.

In the background of separation of power plants from the power grids and establishment of power market it is necessary to implement the profit and loss balance analysis.