It　has　already　been　got　attention　that　excellent　wear　resistance　and　corrosion　resistance　nanostructured　coatings　can　be　prepared　by　thermal　spraying　nanostructured　powders.　The　velocity,　temperature　and　size　of　particles　of　arc　spraying　different　contents　micron/nanostructured　powder　were　measured　by　spraying　watch　and　scan　electron　microscope.　And　the　deformation　of　different　particles　was　observed　by　optical　microscope　and　3D　surface　profile,　the　effect　of　micron-and　nanostructured　powder　on　the　flight　characteristics　and　deformation　of　the　particles　was　analyzed.　Mechanical　properties　of　coating　were　tested.　The　results　show　that　micron/nanostructured　powder　can　improve　bonding　strength　and　toughness　of　the　coating,　and　non-direct　relationships　exist　between　the　powder　size　and　the　particle　wearing　resistance　of　coating,　however,　the　erosion　resistance　of　the　coatings　intensively　depends　on　the　powders　size.　The　influence　mechanism　of　micro/nanosturctured　powder　on　the　particles　characteristics　and　coating　properties　were　investigated.