In the field of aerospace, the measurement of airflow temperature has the dynamic error and the steady state errorat high speed.Numerical simulation research is used to investigate the recovery characteristics for K type temperature sensor in the supersonic condition. The key influential factorsof recovery characteristics are analyzed.The recovery characteristic model for temperature sensor under the supersonic condition is established.It provides the theoretical basis for the experiment and design of the temperature sensor. The result shows thatamong those key influential factors,the single shielded temperature sensor,total temperature and Mach numberare very helpful to improve the recoverycoefficient,the outside diameter of sensor and static pressure help to improve the recovery coefficient very small.