The　influence　of　laser　surface　heat　treatment　on　fatigue　properties　is　investigated　for　the　rolled　polycrystalline　copper　thin　films　in　this　paper.　The　aim　is　to　find　optimal　conditions　of　treatment,　which　will　extend　the　material　resistance　to　fatigue　failure,　and　explore　the　mechanisms　of　fatigue　fracture　and　surface　micro-structure,　by　changing　the　laser　process　parameters.　Results　show　that　scanning　speed　and　power　density　of　laser　treatment　have　greater　influence　on　the　fatigue　life　of　specimens,　which　is　more　than　two　to　three　times　the　original　specimens　life　at　laser　power　density　of　208　kW/cm2,　laser　scanning　speed　of　25　mm/s　for　25　μm　thick　rolled　polycrystalline　copper　thin　films.　SEM　observation　results　for　fracture　surface　show　that　the　hardened　layer　and　the　residual　compressive　stress　are　formed　on　the　surface　area　of　specimens,　which　makes　the　fatigue　strength　of　specimens　significantly　increase.　Since　the　crack　growth　rate　for　laser　heat　treatment　specimens　is　slower　than　that　of　the　original　specimens,　some　fatigue　striations　are　formed　in　the　fatigue　propagation　region.