The response of the South China Sea （SCS） to Typhoon Imbudo was examined using POM model. The results indicated that SST decreased by 2—6℃with a rightward-biased response as Typhoon Imbudo passed across the SCS. Due to a strong mixing process, the mixed layer （ML） depth deepened as much as 10—60m and ML heat budget lost 824.78W/m2, which was dominated by the vertical mixing. By the response of upper ML heat transport, the temperature below the ML increased and oscillated near the inertial period. Furthermore, strong inertial currents were generated by the storm with the max currents up to 1.4m/s in the upper ML.