We　demonstrated　stable　narrow　bandwidth　semiconductor　saturable　absorber　mirror　mode-locked　Yb-doped　all-fiber　laser　in　a　short　linear　cavity　with　fundamental　repetition　rate　up　to　843　MHz.　At　the　fundamental　repetition　rate　of　490　MHz,　the　maximum　output　power　was　17　mW　at　similar　to　300　mW　incident　pump　power.　The　center　wavelength　and　the　spectral　bandwidth　were　1064.1　nm　and　0.13　nm　respectively,　defined　by　a　narrow　bandwidth　fiber　Bragg　grating.　The　pulse　width　was　measured　to　be　21　ps,　and　the　time-bandwidth　product　of　the　laser　pulse　was　0.72.　To　the　best　of　our　knowledge,　this　is　the　first　report　of　all-fiber　scheme　narrow　bandwidth　passively　mode-locked　Yb-doped　fiber　laser　with　hundreds　of　MHz　fundamental　repetition　rate.