Tension　tests　of　3004　aluminum　alloy　were　carried　out　in　a　range　of　strain　rates　from　5.56　×　10-5　s-1　to　5.56　×　10-3　s-1　and　temperatures　from　223　K　to　773　K.　The　micromechanism　of　dynamic　strain　aging　(DSA)　of　the　materials　was　studied　by　calculation　activation　energy,　internal　friction　and　microstructure.　The　results　show　that　there　is　internal　friction　temperature　peak.　The　dislocation　in　the　specimen　forms　a　typical　tangle　structure　and　the　existence　of　Mg　element　in　that　location　is　observed　after　dynamic　strain　aging.　The　phenomenon　of　DSA　of　the　3004　aluminum　alloy　is　controlled　by　the　interaction　between　Mg　solute　atom　atmosphere　and　the　moving　dislocation.