Abstract: For the calculation of the resistance balance in the ventilation and dust removal pipe network, by adjustment of the diameter of the branch pipe, addition of a plug valve and the change of the valve opening, and setting an adjustable orifice type resistance balancer, the resistance balancer system was improved. Software of the corresponding improved system was developed with the VB platform performs, and the calculation and drawing of the pipe network were integrated. The results show that: After using the adjustable orifice plate resistance balancer, the problem of replacing the whole resistance balancer is solved when resistance in pipe is changed, and the cost of the system is lowed; The developed software effectively solves the problems of lengthy calculation procedures, complicated calculation, and confusing data records in the pipe network calculation; The drawing of the pipe network system diagram using VB, Excel and CAD mutual communication is more accurate and faster.