Connected　autonomous　vehicles　(CAV)　are　currently　under　development,　and　the　mixed　flow　with　CAV　would　make　the　traffic　states　more　complicated.　Due　to　the　lack　of　mature　applications,　the　future　traffic　with　CAV　are　still　full　of　uncertainties.　Under　the　new　situation,　the　traditional　cellular　automata　(CA)　model　is　in　need　of　upgrade.　To　discover　the　characteristics　of　traffic　flow　under　different　CAV　penetration　rates,　and　considering　the　particularity　of　the　ramp　segments　on　freeway,　this　paper　updates　the　current　CA　model　and　analyzes　the　car-following　and　lane-changing　behavior　of　mixed　traffic　flow　under　the　intelligent　network.　Results　show　that,　as　the　CAV　penetration　rate　continues　to　increase,　the　road　operation　performance　continues　to　improve,　and　the　capacity　of　the　road　segment　increases　accordingly.　　©　2023　World　Scientific　Publishing　Company.