Thermo-mechanical　coupled　modeling　of　air-plasma-sprayed　(APS)　thermal　barrier　coatings　(TBCs)　on　Ni-based　alloy　was　investigated.　In　the　computational　models,　the　stress　distribution　in　the　depth　direction　of　the　TBCs　and　also　the　influence　of　mechanical　properties　in　heating,　dwelling　and　cooling　thermal　cycles,　were　investigated.　Nonlinear　relationship　(e.g.,　convective　heat　transfer　between　surrounding　environment　and　coatings,　and　thermal　transfer　between　the　different　layers　etc.)　was　considered　in　the　modeling.　The　results　showed　that　the　stress　significantly　reduced　in　the　dwelling　stage　because　of　stress　relaxation.　The　maximum　stress　occurred　in　the　peak　at　the　BC/TGO　interface　and　it　was　amplified　at　the　cooling　stage.　Moreover,　the　internal　stress　in　the　BC　and　TGO　layer　had　a　slight　increase　when　TGO＇s　thickness　increased　whilst　the　stress　in　the　TBC　and　Sub　were　essentially　unchanged.　In　the　present　work,　the　cracks　in　BC　coating　and　the　BC/TGO　interface　cracks　were　simulated　as　well.　The　failure　mechanism　I/II　of　TBCs　had　been　investigated　and　the　results　showed　that　there　was　no　stress　concentration　in　the　vicinity　of　cracks　near　the　peak　at　the　top　coating　layer,　however,　due　to　crack　propagation,　factures　happened　near　the　peak　at　the　BC/TGO　interface.