In the intelligent power distribution network, there are not only tree-topology but also ring-topology, mesh-topology and so on. To establish the power line channel models of the distribution networks with these special topologies and analyse the factors that influence the channel characteristics is the premise and the important basis in application of the PLC in smart distribution network. Based on a universal channel modeling method that is based on information nodes, this paper analyses the influence laws of multiple factors on channel transmission characteristics of the network with mesh topology through simulation, such as the front and rear trunk length, the mesh trunk length, the branch length and the load impedance. The correctness and general applicability of the proposed approach and the conclusions are verified through lab measurements. The proposed analysis method and the conclusions can be used as necessary theoretical basis and technical means to power-line communication modulation method.