This　research　presents　a　novel　port　parametric　modeling　technique　using　three-dimensional　computational　fluid　dynamics　for　the　design　and　optimization　of　intake　and　exhaust　phases　in　side-ported　Wankel　rotary　engines　(WREs).　Definitions　for　the　port　phases　encompass　parameters　such　as　port　start　opening,　port　full　opening,　port　start　closing,　and　port　full　closing　timings.　The　four　port　phase　control　arcs　are　obtained　by　translating　and　rotating　the　rotor　flank　to　satisfy　the　high　control　accuracy.　Further,　the　shape　of　the　port　is　further　smoothed　and　varied　by　four　auxiliary　circular　arcs.　Moreover,　the　influence　of　port　full　closing　timing　and　the　size　of　auxiliary　circular　arcs　(R1,　and　R3)　on　the　intake　characteristics　is　studied.　The　results　show　that　the　novel　method　can　flexibly　and　effectively　control　the　phases　and　shapes.　The　early　port　full　closing　timing　reduces　fluid　backflow　and　improves　volumetric　efficiency　(VE)　but　increases　intake　loss　(IL).　The　small　size　of　R1　facilitates　to　increase　the　VE　and　reduce　IL.　A　larger　or　smaller　size　of　R3　is　not　conducive　to　reducing　IL,　and　the　smaller　size　of　R3　improves　the　VE.　The　novel　generation　method　proposed　in　this　paper　provides　a　theoretical　basis　to　optimize　the　design　of　various　sizes　of　side-ported　WREs　and　guidance　for　practical　manufacturing.　©　2023　The　Authors