Fiber-bulk　hybrid　amplification　technology　combines　the　advantages　of　fiber　lasers　and　bulk　amplifiers　to　obtain　a　compact　and　low-cost　high　power　ultrashort　pulse　laser.　Therefore,　a　high　average　power　ultrashort　pulse　laser　was　designed　based　on　Yb-doped　fiber-bulk　hybrid　amplification　technology.　The　laser　was　consisted　of　an　Yb-doped　all-fiber　laser　and　two-stage　bulk　amplifiers.　The　first　bulk　amplifier　was　based　on　Yb:　YAG　single　crystal　fiber,　and　the　second　bulk　amplifier　was　based　on　Yb:　YAG　rod　with　unpolished　barrel.　The　all-fiber　front　end　delivered　6.5　W　average　power,　52.9　MHz　repetition　rate　and　47.5　ps　pulse　duration.　The　single　crystal　fiber　amplifier　obtained　an　average　power　of　40　W　at　the　backward　pump　power　of　182　W　through　a　single-pass　amplification.　The　Yb:　YAG　rod　amplifier　outputted　an　average　output　power　of　122.9　W　at　the　backward　pump　power　of　307　W　in　single-pass　configuration.　After　removing　the　depolarization　part　introduced　by　thermal　effect,　an　average　output　power　of　107.3　W　with　linear　polarization　state　was　obtained,　and　the　corresponding　slope　efficiency　was　26.1%.　The　pulse　width　of　12.1　ps　and　center　wavelength　of　1030.6　nm　with　spectral　width　of　2.4　nm　were　achieved.　At　the　maximum　output　power　of　107.3　W,　a　beam　quality　factor　of　1.45　and　1.20　were　measured　along　the　vertical　and　horizontal　direction,　respectively.　©　2022　Chinese　Society　of　Astronautics.　All　rights　reserved.