In this paper, the formulae of local parameters are firstly derived under the network-solution and the PPP-solution conditions, respectively.

Study on mine ventilation network solution visual software of fan selection and optimization;

Mine ventilation network solution based on trust region method;

Considering the deficiency of present ventilation network solution software,based on the theory of mine ventilation,set theory and linear algebra,a network solution system is developed with functions of network chart plotting and fan selection by using object oriented Visual C++ 6.

Ventilation network theories and computer technology are applied, a mine ventilation system gathering drawing, data management and ventilation network calculation is developed in this paper.

For displaying reliability of the ventilation network calculation of thissystem,an example in field is supplied.

A safe, reliable, economic and practical coalmine ventilation network calculation software is important to guarantee the safety in production underground.

Use mine ventilation network solution is not only the result of ventilation management enable scientific and efficient, and can reduce mine ventilation costs, increase economic efficiency.

Based on the ventilation network solution scientifically,and applied the theory of Virtual Reality technology ,the paper researched the application software exploitation of mining ventilation system with Virtual Reality.

At last, using a cooperation strategy of vote, calculation of wind net in ventilation is settled by a new way, and an intelligent virtual ventilation simulation system is constructed.

Improved research and implement of ventilation network calculation;

According to the ventilation network calculation of Liaoshang mine area,the ventilation system and the working condition under the mine were improved.