Abstract: The actual network planning project will be influenced by various risk elements.In order to reflect the actual situation,this paper raises the three-dimensional model of general project risk element transmission theory.We build the model by choosing the network planning as the application-dimension,the network form as the risk element transmission route,the analytical method as the risk element transmission method.To calculate the relationship of the nodes in random network,we use the Mason formulation and moment generating function to get the probability distribution characteristics and the risk degree of random network.On this basis,we raise network planning risk element transmission analytic model based on GERT network planning.Finally,we give a case study of the model.

Key words: risk element, transmission, GERT network, analytic method, network planning project