Vortices　are　a　fascinating　flow　phenomenon　and　an　important　research　topic　in　fluid　mechanics.　In　this　study,　the　evolution　of　symmetrical　vortices　within　a　generating　droplet　in　an　altered　T-shaped　microchannel　was　investigated　using　microparticle　image　velocimetry　(micro-PIV)　and　high-speed　imaging　microscopy.　Transient　flow　patterns　within　the　microdroplet　were　visualized　in　the　focal　plane,　revealing　a　high-speed　jet　flow　and　two　counter-rotating　symmetric　vortex　pairs.　These　findings　suggest　that　the　internal　flow　field　of　the　microdroplet　exhibits　intricate　three-dimensional　structures.　The　vortical　flow　behaviors　were　quantitatively　characterized　in　detail　by　calculating　the　vorticity,　rotation,　shear　deformation,　and　tensile　deformation.　These　results　are　crucial　for　comprehending　the　initial　flow　dynamics　and　mixing　processes　occurring　within　generating　microdroplets.　©　The　Author(s),　under　exclusive　licence　to　Springer-Verlag　GmbH　Germany,　part　of　Springer　Nature　2024.