The　durability　of　concrete　is　indirectly　affected　by　its　rheological　properties　at　the　early　stage　of　hydration.　Air　entraining　agent　(AEA),　which　is　widely　used　to　improve　the　fluidity　of　cement　mortar　(CM),　may　alter　the　rheological　properties　of　CM　during　the　early　hydration　process.　This　study　aims　to　investigate　how　AEA　influences　the　physiochemical　mechanism　of　the　fluidity　of　CM.　The　rheological　properties　and　consistency　of　CM　containing　AEA　with　different　curing　times　were　measured.　Resistance　and　electrochemical　impedance　spectroscopy　(EIS)　of　CM　were　monitored　using　digital　bridges　and　electrochemical　workstations.　The　microstructure　of　hardened　CM　was　observed　by　scanning　electron　microscope　(SEM).　The　results　revealed　that　AEA　increased　the　consistency　of　CM,　and　the　rheological　parameters　of　CM　changed　more　complicated.　The　resistance　of　CM　increased　with　the　increasing　AEA　dosage.　The　EIS　curve　displayed　a　unique　electrochemical　response　that　gradually　moved　to　the　upper　right.　The　correlation　analyses　revealed　that　when　the　AEA　dosage　was　between　0　and　0.08%,　the　resistance　was　negatively　correlated　with　the　consistency　and　favorably　correlated　with　the　rheological　parameters,　while　when　the　AEA　dosage　exceeded　0.08%,　the　findings　were　entirely　opposite.　The　varied　correlations　can　be　explained　by　the　counterbalance　between　AEA＇s　heightened　exothermic　effect　and　the　dual　effects　and　existing　forms　of　bubbles.　The　SEM　findings　showed　that　the　bubbles　introduced　by　AEA　were　presented　in　two　forms:　individual　distribution　and　bubble　bridge.　©　2022