The　thermal　and　ablation　effects　of　lasers　are　widely　used　in　laser　additive　manufacturing,　laser　welding,　laser　cleaning,　and　laser　cladding　technologies.　Absorptivity　is　the　core　index　of　laser　beam-thermal　energy　conversion　efficiency.　This　paper　analyzed　the　irradiated　material＇s　absorption　behavior　during　the　solid-liquid-gas　evolution　of　laser-ablated　metal　surfaces　by　comparing　the　temperature　fields　and　the　corresponding　weld　cross-　sections　for　different　laser　action　periods,　considering　the　fusion　and　vaporization　latent　heats.　The　solid-　liquid-gas　state　evolution　of　high-power　fiber　laser-irradiated　metal　surfaces　occurs　during　several　milliseconds,　with　a　short　solid-phase　existence　period,　since　fusion　or　melting　time　is　much　shorter　than　the　vaporization　time.　As　the　solid-liquid-gas　state　evolves,　the　average　absorptivity　and　the　share　of　thermal　conduction　energy　loss　decrease　with　the　laser　action　time,　while　the　fusion　energy　loss　gradually　increases.　The　solid-phase　surface　of　the　metal　in　laser　processing　absorbs　significantly　more　incident　laser　energy　than　the　liquid-phase　one.　The　longer　the　solid-phase　occurrence　period　of　the　metal　surface　during　the　laser　action,　the　greater　its　average　absorptivity　of　the　incident　laser.　By　increasing　the　laser　spot　area　and　scanning　rate,　the　solid-phase　period　of　the　laser-irradiated　metal　surface　can　be　increased,　improving　its　incident　laser　absorptivity.