To　better　understand　the　effect　of　initial　static　loading　on　the　dynamic　shear　performance　of　concrete　deep　beams　reinforced　with　basalt　fiber-reinforced　polymer　(BFRP)　bars,　a　three-dimensional　mesoscale　numerical　model　was　established　considering　the　strain　rate　effect　of　each　material　and　the　interaction　between　concrete　and　BFRP　bars.　The　effect　of　the　initial　static　loading　on　the　damage　evolution　and　failure　mechanism　of　the　concrete　deep　beams　(shear　span　ratio　lambda　=　1.0)　reinforced　with　BFRP　bars　(BFRP-RC　deep　beams)　with　different　stirrup　ratios　was　analyzed.　The　results　prove　that:　(1)　the　shear　capacity,　failure　mode,　and　deformation　capacity　of　BFRP-RC　deep　beams　have　a　strain　rate　effect,　that　is,　the　shear　capacity,　deformation　capacity,　and　damage　degree　of　beams　increase　with　the　increase　of　strain　rate;　(2)　the　increase　of　strain　rate　and　stirrup　ratio　can　improve　the　shear　capacity　and　deformation　capacity　of　beams,　while　the　strain　rate　plays　the　leading　role;　and　(3)　the　shear　capacity,　deformation　capacity,　and　damage　degree　of　BFRP-reinforced　concrete　deep　beam　decrease　as　the　initial　static　loading　increases　under　different　strain　rates.　However,　the　increase　in　strain　rate　will　weaken　the　effect　of　initial　static　loading　on　the　dynamic　performance　of　the　beams.