| The hydraulic calculation of water pipe-network has the character that it has many variables and the restriction terms are very complicated. In the pipe-network design of the past, first thing is to get the basic data and the graphic information of pipe-network. And then, input them into the program to carry out calculation. At last, return the calculation results into the graph. The whole work is very large, there many human action in it, so it is easy to make some mistake in the calculation. In the article, by the use of developing ability of Visual Basic Language to AutoCAD, get the data and graphic information of pipe-network directly from the graph, and realize the data input and modification from outside. At the same time, with the knowledge of Graph Theory, get the incidence matrix and the circuit matrix from the data, thus realize the hydraulic calculation. After that, return the calculation results to the graph. And in the whole process, Access database is used to save, modify and obtain the data which calculation demands.Node pressure is one important index of pipe-network operation and the basis of macro-modeling of pipe-network. If master the whole pressure information of pipe-network quickly, there important effect to water supply quality, operation safety, water and energy saving, operation efficiency and so on. In the article, through the analysis to basic equation and incidence matrix of pipe-network, using the calculation results to establish the relation matrix of node pressure variable. Then utilize the Blur Clustering method to gather nodes which have more resemble relation. Finally, select one point as pressure detecting point in each cluster.In the process of research, make use of Visual Basic developing ability to AutoCAD and Access, and then realize the combination graph interface and hydraulic calculation. Further more, analyzing the disposal of pressure detecting point based on calculation results by example.
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