In　order　to　study　the　macro-model　of　vehicle　exhaust　emissions　in　accordance　with　the　national　conditions　of　our　country,　this　paper　tests　the　gas　emissions　of　three　different　types　of　diesel　touring　vehicles　by　using　PEMS　system,　and　analyzes　the　relationship　between　their　emission　characteristics,　vehicle　speed　and　acceleration.The　results　show　that　the　emission　factor　has　a　strong　positive　correlation　with　vehicle　speed　and　acceleration,　so　increasing　the　driving　speed　and　reducing　the　acceleration　frequency　can　effectively　reduce　the　emission　of　pollutants.　At　the　same　time,　the　COPERT　model　is　used　to　predict　the　emission　factors.　Compared　with　the　measured　values,　the　COPERT　prediction　values　of　each　pollutant　are　on　the　low　side,　and　the　error　range　is　7%　-　65%,　which　provides　a　theoretical　basis　for　further　exploring　the　applicability　of　COPERT　model　in　China.　(C)　2020　The　Authors.　Published　by　Elsevier　B.V.