In　this　paper,　resonance　responses　and　bifurcations　of　the　circular　mesh　antenna　with　1:3　internal　resonance　in　thermal　environment　are　studied.　Considering　this　internal　resonance,　based　on　the　equivalent　circular　mesh　antenna　model,　which　is　a　composite　laminated　circular　cylindrical　shell　clamped　along　a　generatrix　and　with　the　radial　pre-stretched　membranes　at　both　ends　in　thermal　environment,　we　obtain　the　amplitude-frequency　response　curves　of　the　system　in　the　state-parameter　space　by　using　the　prediction-correction　continuation　algorithm　in　order　to　study　the　bifurcation　characteristics　of　the　equivalent　circular　mesh　antenna　model.　Meanwhile,　the　fold　bifurcation　points　and　Antronov-Hopf　bifurcation　points　are　detected　and　located　on　these　resonance　response　curves.　We　find　that　the　nonlinear　vibrations　of　the　equivalent　circular　mesh　antenna　model　have　the　hardening　characteristics,　and　the　temperature　excitation　has　noticeable　effects　on　the　stabilities　and　bifurcations　of　this　system.