Recent　years,　the　oil　and　gas　industry　of　China　has　made　great　progress　in　the　overseas　markets　under　the　guidance　of　＂going　out＂　policy.　The　assessment　for　the　investment　climate　of　the　overseas　target　regions　and　countries　is　one　of　the　critical　issues　in　decision-making　and　implementation　of　overseas　projects.　This　article　investigates　a　model　for　the　assessment　of　investment　climate　of　different　countries.　The　model　method　is　composed　of　weighed　calculation,　Delphi　Method,　and　the　Analytic　Hierarchy　Process　(AHP)　with　main　factors　analysis.　The　investment　climate　of　32　countries　selected　has　been　researched　under　this　model.　Except　Vietnam,　all　other　31　countries　fall　into　the　first　and　second　group　according　to　their　complex　credits.　Regarding　the　five　regions　in　the　world,　we　present　the　suggestions　for　each　region　on　the　investment　climate　for　Chinese　oil　and　gas　industry,　which　can　be　referred　when　the　Chinese　oil　companies　are　investing　into　these　regions　and　countries　in　the　future.