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In order to solve the network planning problem considering risk elements efficaciously, we redefine the network planning in this paper and transform the classical network chart to the new network chart based on combining neural network theory. On this basis, a risk classification is listed for the construction project, and we give the evaluation activity indexes using the expert assessment. Then, a risk classification is listed for the construction project. In order to get the total risk degree of all the network routes, after setting a certain weight and threshold value, we regard the indexes as the neural network input vector and calculate the risk degree of various activities. Thus, the total risk degree of all the network routes can be got. Finally, the model algorithm is illustrated with a case study.