Abstract: The algorithm of network dividing wind is important content for studying ventilation network calculation.The speed of calculating network by computer is limited by dividing wind algorithm.The calculation of traditional loop and node method with complex procedure needs long time to compute large-scale network due to the calculation of loop or iteration acceleration coefficient.The network dividing wind algorithm based on the node press-energy,with advantages of opting initial value of amount wind and less iterations,avoids the calculation of loop and iteration acceleration coefficient.The accuracy of the result is met for the actual requirements;it has a guiding role for ventilation network calculation research.