Particle　damping　technology　has　a　lot　of　advantages,　such　as　a　notable　effect　at　wide　frequency　bandwidth,　little　modification　of　the　original　structure,　flexibility　of　layout,　etc.　So　it　has　been　widely　researched　in　mechanical　and　aviation　field,　while　is　still　in　the　immature　period　in　civil　engineering.　Take　a　single　degree　of　freedom　steel　frame　as　research　object,　influences　of　additional　mass　ratio,　particle　radius,　friction　coefficient　of　container,　packing　state　of　particles,　length　of　the　container　along　vibration　orientation　and　excitation　intensity　were　researched　through　free　vibration　experiment.　The　results　show　that,　with　the　increasing　of　the　particle　mass,　the　additional　damping　ratio　increases　at　the　beginning　and　then　decreases;　the　smaller　particle　shows　better　effect　than　the　bigger　one;　increasing　the　friction　coefficient　can　cause　a　bad　effect　on　vibration　controlling;　when　the　particles　do　not　pile　up,　the　size　of　the　container　doesn＇t　have　much　influence,　increase　the　length　of　the　container　along　the　direction　of　the　vibration,　the　effect　becomes　worse　slightly;　with　the　increasing　of　the　excitation　intensity,　the　additional　damping　ratio　increases　at　first　and　then　maintains　at　a　certain　level.　All　of　these　results　indicate　that　particle　damping　technology　has　a　good　effect　on　reducing　the　vibration　of　single-degree　freedom　structure;　it　has　a　wide　prospect　in　civil　engineering.