Linked　polyurethane-acrylate　(LPUA)　emulsions　with　good　stability　were　synthesized　by　seed　swelling　emulsion　polymerization.　We　then　investigated　the　thermal　degradation　process　of　the　LPUA　film　by　means　of　thermogravimetry-　derivative　thermogravimetry　(TGDTG)　at　different　heating　rates.　It　was　shown　that　the　heating　rate　had　obvious　influence　on　the　thermal　weight　loss　of　LPUA.　Both　the　starting　and　ending　temperatures　of　decomposition　shifted　to　a　higher　temperature　with　increased　heating　rate.　The　most　probable　kinetic　parameters　of　decomposition　were　obtained　from　the　Coats-Redfern　integral　equation　and　Achar　differential　equation.　It　was　shown　that　the　optimum　mechanism　functions　of　the　decomposition　reaction　were　3D　diffusion,　spherical　symmetry,　D4,　and　deceleration　type　a-t　curve.　The　thermal　decomposition　mechanism　function　of　the　LPUA　film　was　f　(α)　=　3/2[(1-α)-1/3-1]-1;　G(α)=(1-2α/3)-(1-α)2/3.　©　ASTM　Int＇l　(all　rights　reserved).