The　Heterogeneous　Network-on-Chip　(HNoC)　integrates　CPU　cores,　Graphic　Processing　Unit　(GPU)　cores,　last-level-cache　and　memory　controllers.　The　heterogeneity　of　this　architecture　inevitably　brings　resource　contention　and　energy　shortage.　In　this　work,　we　evaluate　the　impact　of　different　capacity　of　router　buffers　on　communication　delay　and　energy　consumption.　We　run　benchmarks　to　simulate　different　characteristics　of　the　real-world　applications,　with　the　aim　to　balance　performance　with　energy　consumption　under　buffer　resource　limitations.　Our　evaluations　of　HNoC　show　that　when　the　buffer　resources　are　limited,　by　allocating　more　buffer　to　GPU,　the　energy　consumption　decrease　by　an　average　of　44.6%,　while　the　performance　degradation　is　negligible.