In　order　to　investigate　and　compare　the　effect　of　different　policies　of　energy-conservation　and　emission-reduction　(ECER),　this　paper　constructs　a　systematic　model　which　affects　the　ECER,　with　elements　such　as　government　economy,　population,　technology,　energy　and　environment,　and　takes　Fujian　province　as　a　case　to　determine　the　parameters　and　main　equations,　while　adds　policy　adjustment　factors　from　tax,　finance,　fiscal,　environmental　protection,　industry　and　science　and　technology　on　each　subsystem　via　system　dynamics　to　further　simulate　different　policy　instruments.　The　results　show　that:　given　scenarios　and　parameters,　on　the　one　hand,　the　adjustment　and　implementation　of　policies　can　often　promote　ECER,　but　we　can　not　blindly　change　the　implementation　of　policies.　On　the　other　hand,　different　policies　have　the　distinct　effectiveness　of　its　ECER　practice,　specifically,　the　effect　of　taxation,　environmental　protection　and　industrial　policy　on　ECER　is　significant　where　the　front-end　pollution　control　of　main　pollutant　on　environmental　protection　policy　works　well.　By　contrast,　the　financial,　fiscal　and　technological　policies　effect　of　ECER　is　relatively　weak.　©　2018,　Editorial　Board　of　Journal　of　Systems　Engineering　Society　of　China.　All　right　reserved.