Lanthanum　zirconate　(La2Zr2O7)　has　been　proposed　as　a　promising　thermal　barrier　coating　(TBC)　material　due　to　its　low　thermal　conductivity　and　high　stability　at　high　temperatures.　In　this　work,　both　single　and　double-ceramic-layer　(DCL)　TBC　systems　of　La2Zr2O7　and　8　wt.%　yttria-stabilized　zirconia　(8YSZ)　were　prepared　using　air　plasma　spray　(APS)　technique.　The　thermomechanical　properties　and　microstructure　were　investigated.　Thermal　gradient　mechanical　fatigue　(TGMF)　tests　were　applied　to　investigate　the　thermal　cycling　performance.　The　results　showed　that　DCL　La2Zr2O7　+　8YSZ　TBC　samples　lasted　fewer　cycles　compared　with　single-layered　8YSZ　TBC　samples　in　TGMF　tests.　This　is　because　DCL　La2Zr2O7　TBC　samples　had　higher　residual　stress　during　the　thermal　cycling　process,　and　their　fracture　toughness　was　lower　than　that　of　8YSZ.　Bond　strength　test　results　showed　that　8YSZ　TBC　samples　had　higher　bond　strength　compared　with　La2Zr2O7.　The　erosion　rate　of　La2Zr2O7　TBC　samples　was　higher　than　that　of　8YSZ　samples,　due　to　the　lower　critical　erodent　velocity　and　fracture　toughness　of　La2Zr2O7.　DCL　porous　8YSZ　+　La2Zr2O7　had　a　lower　erosion　rate　than　other　SCL　and　DCL　La2Zr2O7　coatings,　suggesting　that　porous　8YSZ　serves　as　a　stress-relief　buffer　layer.