Benchmark models of seismic topological optimization of lifeline systems are important means of evaluating the validity and applicability of some new optimization algorithms.In this paper

based on the model of seismic topological optimization of lifeline systems

three Benchmark models on such optimization problem are presented firstly

then all of the networks belonging to the solution space are emulated by exhaust algorithm under the development environment of Visual Compaq Fortran

whereafter the optimal networks and some suboptimal networks subjected to different nodal reliability constraint are accurately located.Finally

based on the above proposed Benchmark models

the ant colony algorithm applied to seismic topological problem of lifeline network systems is tested.It is clear that the ant colony algorithm can accurately locate the optimal networks in small scale networks and likely find the optimal networks or suboptimal networks as the network’s scale increasing.