A　healing　method　for　fatigue　damage　was　studied　by　laser　shock　peening　(LSP)　with　excimer　laser　for　polycrystalline　copper　film.　It　is　found　that　work　hardening　due　to　LSP　could　be　responsible　for　the　improvement　of　residual　fatigue　lives　for　the　damaged　and　undamaged　specimens　by　LSP,　and　the　hardening　degree　for　the　damaged　specimen　by　LSP　is　obviously　higher　than　that　for　the　undamaged　specimen　by　LSP.　In　this　paper,　two　basic　mechanisms　were　identified.　One　is　the　dissipated　energy　enhancement　mechanism,　which　improves　the　fatigue　life　caused　by　laser　shock　stress,　and　the　other　is　the　healing　mechanism,　which　leads　to　a　further　improvement.　Based　on　the　two　mechanisms,　a　residual　fatigue　life　prediction　method　is　proposed　by　the　view　of　energy　consumption　before　and　after　LSP.　The　predicted　lives　by　the　proposed　method　agree　well　with　the　experimental　results.