According　to　uniaxial　loading-displacement　curves　of　TC4　titanium　alloy,　The　parameters　of　Gurson-Tvergaard-Needleman　model　(GTN　model)　were　determined　by　an　inverse　approach.　The　influence　of　6　different　GTN　model　parameters　on　simulation　results　were　studied　by　finite　element　method.　It　is　found　that　only　the　parameters　of　f(0)　and　f(N)　need　to　be　determined　by　the　inverse　approach,　epsilon(n)　defined　by　tensile　test,　S-n　determined　by　calculation,　f(c)　and　f(F)　could　be　given　by　simulation　results　directly.　Voids　damage　evolution　becomes　faster　with　appearing　of　necking　stages　of　TC4　titanium　alloy,　until　failure　fracture.