In this paper

we present the renovation and study of multi-route networking for SDH.In order to resolve the limit of SDH ring-networking

multi-route and muti-office direction networking based on the current traditional SDH network is proposed

considering networking practice made to resist the following destroy of "5.12" earthquake in Sichuan province.On the premise of fully using current SDH resources and saving investment

the program can make the SDH network gain the similiar stability of ASON

which not only enhances the ablility which resists the muti-point break

but also ensures the safety of network.