Increasing　integration　of　the　information　communication　technology　introduces　security　vulnerabilities　into　smart　grid.　False　data　injection　attack　can　exploit　the　cyber　vulnerabilities　to　compromise　the　physical　grid　without　being　detected.　However,　the　existing　attack　strategies　only　consider　the　electrical　characteristic　of　power　flow　calculation　to　induce　multiple　overloaded　branches.　On　this　basis,　our　attack　strategy　absorbs　the　topological　adjacency　of　chain　subgraph　to　induce　the　overloaded　branch　chains,　which　can　better　characterize　the　sequential　propagation　of　cascading　failures.　To　this　end,　a　game-theoretical　bilevel　optimization　problem　is　formulated　to　model　the　decision-making　interaction　between　the　upper-level　attacker　and　the　lower-level　security　constrained　economic　dispatching　system.　The　simulation　results　in　IEEE　test　systems　verify　that　our　attack　strategy　can　induce　the　overloaded　branch　chains　and　justify　that　the　overloaded　branch　chains　are　more　effective　than　the　overloaded　branches　in　triggering　the　cascading　failures.　©　1994-2012　IEEE.