In　this　work,　we　synthesized　high-quality　InAs　nanowires　by　a　convenient　chemical　vapor　deposition　method,　and　developed　a　simple　laser　heating　method　to　measure　the　thermal　conductivity　of　a　single　InAs　nanowire　in　air.　During　the　measurement,　a　focused　laser　was　used　to　heat　one　end　of　a　freely　suspended　nanowire,　with　its　other　end　embedded　into　a　carbon　conductive　adhesive.　In　order　to　obtain　the　thermal　conductivity　of　InAs　nanowires,　the　heat　loss　in　the　heat　transfer　process　was　estimated,　which　includes　the　heat　loss　through　air　conduction,　the　heat　convection,　and　the　radiation　loss.　The　absorption　ratio　of　the　laser　power　in　the　InAs　nanowire　was　calculated.　The　result　shows　that　the　thermal　conductivity　of　InAs　nanowires　monotonically　increases　from　6.4　W　m(-1)　K-1　to　10.5　W　m(-1)　K-1　with　diameters　increasing　from　100　nm　to　190　nm,　which　is　ascribed　to　the　enhanced　phonon-boundary　scattering.