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For improve the backup navigation system, the research was carried out in the light of network cluster position under the denial environment combined the current navigation system’s demand for backup navigation. On the basis of MDS, this article derives the process of MDS(Multidimensional scaling) for cluster position. The insufficiency and the limitation of the traditional MDS is analyzed by this article. According to demand of traditional MDS of distance between nodes, this article put forward a new technique for network cluster position combined the MDS and the Trilateration, which makes up for missing distance information with Trilateration, not only decreasing the optimal path error in MDS, but also reducing the number of propagation plies of error in Trilateration, and improving the positioning accuracy. The correctness and feasibility of this method is verified. Finally, we find out in which point this method can be optimized.