Shorter path first strategy to build topology matching overlay was presented.First

passive landmark based network distance prediction method was presented

and the network distance between peers could be predicted correctly with low overload and deployment cost.Then

table based diagonal space-filling curve map algorithm was presented

which could accelerate topology information selection.Finally

the process of building overlay using shorter path firs（SPF） strategy was described in detail.Experiment results shown that the SPF overlay can improve the topology matching remarkably.