The　effects　of　the　grain　boundary　precipitation　on　intergranular　corrosion　behavior　were　investigated　by　exfoliation　tests　and　complementary　techniques　like　scanning　electron　microscope　(SEM),　optical　profilometry　(OP),　transmission　electron　microscope　together　with　energy　dispersive　spectroscopy　(TEM-EDS),　and　atomic　force　microscope　(AFM).　The　results　reveal　the　influencing　mechanism　of　intergranular　corrosion　behavior　from　grain　boundary　precipitates　(GBPs).　The　potential　discrepancy　between　GBPs　and　adjacent　areas　induces　corrosion　cavity　germination　along　the　grain　boundary.　Furthermore,　the　increase　of　both　active　Mg　and　Zn　content　in　GBPs　improve　the　potential　difference,　which　aggravates　the　intergranular　corrosion　cavity　germination.　However,　the　increment　of　noble　Cu　content　in　GBP　is　beneficial　to　reduce　the　potential　difference.　On　the　other　side,　the　distribution　of　the　continuous　precipitates　in　the　grain　boundary　region　helps　the　initial　corrosion　cavities　to　connect,　which　improves　the　growth　of　intergranular　corrosion　cracks.　Additionally,　discontinuous　GBPs　and　precipitation　free　zone　(PFZ)　hinder　the　spread　and　connection　of　intergranular　corrosion　cavities.　Therefore,　7050　aluminum　alloy　forming　different　grain　boundary　precipitation　characteristics　after　different　aging　treatments　shows　different　resistance　to　intergranular　corrosion:　peak-aging　＜　under-aging　＜　over-aging.