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Faced to the challenges and difficulties of constructing 3DGIS, the paper puts forward the approach of 3D spatial data transmission based on hybrid Peer-to-Peer (P2P) network, which are result from the analyzing of the current structure of 3DGIS and the adaptability of the existed P2P network firstly. Based on the analysis of the difference between the spatial data management of P2P model and central server model, this paper designs spatial data tile and partition scheme. This paper also studies the mechanism of the dynamic P2P network constructing. And the algorithm of spatial data transportation based on P2P network is designed. The test shows the performance of this scheme is better than that of the transmission based on central server model.