Based　on　the　theories　and　methods　of　complex　network,　and　with　CRH3　EMU　as　an　example,　the　relational　network　of　component　maintenance　for　high-speed　train　in　China　was　constructed.　The　average　degree　of　nodes,　average　path　length,　network　density　and　clustering　coefficient　were　calculated　and　analyzed　to　reveal　the　topological　features　of　the　network.　The　result　shows　that　in　the　relational　network　of　component　maintenance　for　CRH3　EMU,　the　average　path　length　is　short　and　the　network　density　is　moderately　heavy.　The　distribution　of　node　degree　follows　exponential　distribution.　The　properties　indicate　that　the　network　is　a　small-world　network.　The　dependency　relationship　among　maintenance　components　should　be　considered　in　the　design　phase　of　high-speed　train　so　as　to　facilitate　maintenance　resource　allocating,　maintenance　policy　making　and　maintenance　cost　reducing.　For　the　component　with　higher　node　degree　and　clustering　coefficient　which　may　affect　the　safety　of　train　operation,　more　maintenance　resources　should　be　distributed.