Abstract: Under 1000°C and strain rate range of 0.01~10 s^-1, the hot compression test of super duplex stainless steels S32750 was carried out with MMS-200 thermal-mechanical simulator. EBSD(electron backscattering diffraction) technique was applied to analyze grain orientation and grain boundary characters. The results showed that the <111> texture appears in ferrite under lower strain rate, and the additional <001> texture appears under higher strain rate. The ferrite grains become finer and the number of small angle grain boundaries increases with the increasing of strain rate. The <110> texture appears in the deformed austenite under the strain rate of 10 s^-1. The austenite grain size and the number of small angle grain boundaries increase with the increasing of strain rate. A lot of Σ3 twin boundaries appear in the deformed austenite under lower strain rate.