Many　theoretical　and　experimental　studies　showed　that　stress　triaxiality　has　an　important　influence　on　ductile　fracture.　However,　recent　studies　showed　that　Lode　parameter,　which　can　be　linked　to　normalized　third　stress　invariant,　is　also　an　essential　factor.　In　the　present　study,　round　notched　bar　and　flat　grooved　plate　specimens　made　of　7075　aluminum　alloy　were　used　to　assess　the　effect　of　stress　triaxiality　and　Lode　parameter　on　ductile　fracture　and　on　the　corresponding　microscopic　mechanism.　Quasi-static　tensile　tests　and　parallel　numerical　simulations　were　conducted　to　obtain　stress　triaxiality,　Lode　parameter　and　failure　locus.　A　fractographic　analysis　was　performed　to　determine　the　rules　of　void　evolution　under　different　stress　states.　The　results　show　that　stress　triaxiality　and　Lode　parameter　have　an　important　influence　on　failure　strain.　The　effect　of　Lode　parameter　decreases　with　the　increase　in　stress　triaxiality.　The　fractographs　show　that　the　size　of　the　void　decreases　with　the　increase　of　stress　triaxiality,　and　the　morphologies　of　the　voids　of　different　Lode　parameters　are　obviously　different.　The　nucleation　rate　and　growth　degree　of　secondary　voids　are　also　affected　by　Lode　parameter.