When there is on electrical power, slow descending control of circular chain ladder as well as to assure the reliability in use when set aside for a long time has to be solved.

The market-share-first strategy is adopted by many enterprises during growing period of industry, but the speed of profits descending in the implementation process is hard to control.

Based on the sensitivity of neural network of system identification, a method of descending neural network sensitivity in control systems is proposed in this paper.