The　thermal　shock　resistance　and　electrochemical　corrosion　behaviors　of　Al-Ti-Si-RE　coating　before　and　after　thermal　shock　were　investigated.　The　results　show　that　the　Al-Ti-Si-RE　coating　could　keep　good　thermal　shock　resistance　at　500　degrees　C,　and　the　electrochemical　corrosion　resistance　before　and　after　thermal　shock　does　not　decline　sharply,　which　is　caused　by　more　metallurgical　combinations　between　the　coating　and　the　substrate　due　to　the　reaction　heat　of　Ti　and　Al　in　the　high　speed　electric　arc　spraying　process.　At　the　same　time,　by　transmission　electron　microscopy　(TEM)　observation,　the　grain　sizes　of　the　coating　are　small,　and　Al　and　Ti-Al　intermetallics　have　a　good　coherency,　which　could　all　reduce　the　coating　cracking　sensitivity.　In　addition,　Al-Ti-Si-RE　coating　has　a　good　cage　construction,　whose　voids　and　coating　cracks　could　be　sealed　by　Al　oxides,　and　it　could　play　the　role　of　self-sealing　and　self-healing,　and　make　the　coating　thicker　with　good　resistances　of　thermal　shock　and　electrochemical　corrosion.