Abstract: The reliability of telecommunication networks is oneof the most important quality indicators.Based on the analysis of indicator system of telecommunication network reliability, a model is provided to evaluate the growth of telecommunication networks reliability.In the evaluating model, howto determine the weight of every reliability indicator is a key problem.We use neural networks method to determine the weight of every indicator.Finally, an example that the evaluating model is applied in a local network is given.

Key words: telecommunication networks reliability, reliabilityindicator, evaluation method, BP neural networks algorithm