In　heterogeneous　multi-core　architecture,　a　large　number　of　shared　last　level　cache　(LLC)　space　is　occupied　by　GPU　applications,　leading　to　the　system　performance　degradation.　This　paper　presented　a　LLC　buffer　management　strategy　based　on　heterogeneous　multi-core,　buffer-for-GPU　(BFG).　A　buffer　was　added　on　the　side　of　LLC　to　filtrate　streaming　requests　of　GPU.　Cache　insensitive　GPU　messages　directly　accessed　to　buffer　instead　of　accessing　to　LLC.　Then,　for　different　characteristics　of　CPU　applications　and　GPU　applications,　a　reasonable　replacement　strategy　was　adopted　to　increase　the　cache　hit　rate.　Resulst　show　that　compared　with　the　traditional　heterogeneous　multi-core　structure,　the　LLC　buffer　management　strategy　improves　the　CPU＇s　and　the　GPU＇s　IPC　by　2.48%　and　9.30%　on　average,　and　improves　the　hit　rate　of　CPU　applications　by　70.45%　on　average.　BFG　can　effectively　filter　the　GPU　requests,　vacate　space　to　CPU　applications,　and　improve　system　performance.　©　2019,　Editorial　Department　of　Journal　of　Beijing　University　of　Technology.　All　right　reserved.