Convective　Polymerase　Chain　Reaction　(cPCR),　owing　to　its　enhanced　thermal　cycling　efficiency,　holds　promise　for　application　in　the　next　generation　of　mainstream　commercial　PCR　instruments.　Despite　its　potential,　existing　capillary-based　and　annular　reaction　chamber　designs　encounter　limitations　in　precisely　controlling　the　internal　flow　field,　which　poses　a　significant　barrier　to　the　progression　of　cPCR.　To　overcome　these　obstacles,　this　work　innovatively　proposes　a　cPCR　chip　utilizing　a　＇racetrack-shaped＇　reaction　chamber,　along　with　a　reverse　design　approach　tailored　to　meet　diverse　reaction　requirements.　Through　modeling　and　simulation,　we　accurately　obtained　the　relationship　between　the　design　parameters　and　the　average　flow　velocity　of　the　cPCR　chip　with　a　＇racetrack-shaped＇　reaction　chamber.　By　capturing　the　motion　of　fluorescent　particles　using　a　high-speed　camera,　we　acquired　the　velocity　distribution　of　the　actual　flow　field.　Further,　we　utilized　these　relationships　to　conduct　a　reverse　design.　Ultimately,　a　reaction　chamber　was　designed　based　on　the　actual　amplification　needs　of　2019-nCoV　and　hepatitis　B　virus,　and　successful　amplification　was　achieved　using　a　self-developed　temperature　control　platform.　©　2025　by　the　authors.