Aiming　at　the　shortcomings　of　current　particle　dampers　and　the　need　for　seismic　absorption　in　civil　engineering,　a　parallel　single-dimensional　single　particle　damper　(PSSPD)　is　proposed.　Considering　the　damping　mechanism　and　the　stress　state　of　particles,　the　mechanical　model　of　PSSPD　is　established　and　its　numerical　analysis　method　is　put　forward.　The　analytical　expression　of　displacement　response　of　PSSPD-SDOF　in　stable,　symmetrical　and　periodic　collision　state　is　obtained　under　harmonic　excitation.　Based　on　this　result,　the　influence　of　each　parameter　on　the　performance　of　PSSPD　and　the　relationship　between　the　optimal　distance　of　particle　motion　and　other　parameters　are　analyzed,　and　its　accuracy　is　verified.　Then,　the　optimization　analysis　method　of　PSSPD　in　ground　motion　is　put　forward,　and　its　rationality　and　accuracy　are　verified.　Immediately,　the　effect　of　PSSPD　on　the　structure　under　the　optimal　design　parameters　and　different　ground　motions　is　studied.　The　results　show　that　as　a　PSSPD　belongs　to　an　acceleration　(force)-dependent　damper,　the　energy　of　a　controlled　structure　will　be　transferred　if　the　particle　collides,　and　the　randomness　of　seismic　spectrum　enhances　the　probability　of　particle　collision.　A　PSSPD　has　a　fine　damping　effect　for　ground　motions　of　different　site　types,　and　the　site　effect　on　damping　ration　is　not　significant.　A　PSSPD　is　more　suitable　for　a　middle　and　low-rise　structure.　©　2020,　Engineering　Mechanics　Press.　All　right　reserved.