Abstract: Induction heating process of seamless steel tube with midfrequency features short heating time,precise temperature control and environment-friendly operation,having been widely used for such purposes as steel tube quenching and bending,etc.Following the induction-heating process for quenching of a certain typical type of seamless steel tube,and in particular the variation of frequencies for each different heating section,numerical stimulation is conducted.,which leads to the identification of the temperature field change during the entire heating process of the tube.Thanks to the said simulation model,the operating parameters of induction heating process can be optimized,which in turn provides relevant important reference data as basis for establishing proper induction-heating process for quenching of seamless steel tubes.