Abstract: The hot deformation behavior of high-purified 17%Cr ferritic stainless steel at strain rates from 1 s^-1 to 10 s^-1 and deformation temperatures from 600°C to 1100°C was investigated by Thermo-Calc thermodynamic calculation and MMS200 thermomechanical simulator. The results showed that the high-purified 17%Cr ferritic stainless steel presents a ferritic (α-Fe, bcc) microstructure without γ/α phase transformation and undergoes rapid dynamic recovery during the hot deformation. The high-purified 17%Cr ferritic stainless steel has activation energy of 384.985 kJ/mol for hot deformation. On this basis, Zener-Hollomon parameter can be determined and the correlation of Zener-Hollomon parameter with peak stress was obtained.