Effect　of　heat　treatments　on　the　stress　corrosion　behavior　of　7050　Al　alloys　in　3.5%　NaCl　solution　has　been　investigated　using　slow　strain　rate　tensile　(SSRT)　test.　During　the　slow　strain　rate　tensile　process,　electrochemical　impedance　spectroscopy　(EIS)　in　real　time　was　carried　out　to　characterize　the　electrochemical　behavior　for　different　tempers　7050　Al　alloys.　The　investigation　shows　that　both　the　stress　corrosion　resistance　of　7050　Al　alloys　is　controlled　by　heat　treatments　due　to　the　different　precipitates　state.　The　improvement　of　stress　corrosion　resistance　is　contributed　to　the　tiny　precipitates　in　matrix　which　are　beneficial　to　corrosion　potential　and　maintain　passivation,　and　precipitates　discontinuous　distribution　at　grain　boundary　which　obstruct　intergranular　crack　connection.　Moreover,　base　on　the　results,　we　find　out　retrogression　and　re-aging　(RRA,　i.e.,　T6　+　200　°C/　retrogression　+　water　quench　+　T6)　increases　both　tensile　strength　and　stress　corrosion　resistance.　The　optimized　of　retrogression　time　is　30　minutes.　©　2017　Trans　Tech　Publications,　Switzerland.