The　automotive　industry　plays　very　significant　role　in　Chinese　industry.　but　higher　energy　consumption　and　higher　pollution　accompanying　with　the　vehicle’s　industry　chain　as　well.　natural　gas　for　vehicles　has　the　characteristics　of　cleanness,　economy　and　reliability.　Therefore,　the　hybrid　vehicle　with　both　advantages　of　natural　gas　and　electricity　has　great　potential.　However,　it　is　unclear　that　the　promotion　of　natural　gas　/　electric　hybrid　vehicles　(NGEHV)　could　really　achieve　energy　saving　and　emission　reduction.　In　this　paper,　consider　all　stages　vehicle　production,　transportation,　use,　maintenance　and　scrap　recovery,　the　possession　is　decomposed　into　three　aspects:　resource　attributes,　energy　attributes　and　environmental　attributes.　An　composition　analysis　method　of　NGEHV　is　constructed.　A　life　cycle　assessment(LCA),　in　the　view　of　Cradle-to-Grave,　of　environmental　impact　for　natural　gas　/　electric　hybrid　vehicles　is　established.　Based　on　BP　neural　network,　prediction　information　of　traditional　vehicles　and　NGEHV　on　various　environmental　factors　and　costs　are　obtained.　It　could　provide　scientific　basis　for　the　sustainable　advancement　and　decision-making　for　government.