Pure tungsten shows the higher promise as plasma-facing material because of its low sputtering yield,high melting point and high thermal conductivity.The recrystallization behavior of a highly-deformed warm-rolled pure tungsten with 90%thickness reduction was investigated by isothermal annealing in the temperature range of 1200-1350℃.Changes in the mechanical properties caused by recovery and recrystallization during heat treatment were obtained by Vickers hardness measurements.Additionally,microstructural evolution was quantified by light optical micrographs,the analysis of the grain size distribution and XRD peaks,respectively.The results indicate that the hardness evolution can be divided into two stages: recovery and recrystallization.Microstructure evolution and hardness changes can correspondence with the results of XRD.The recrystallization kinetics were given by Arrhenius relation for different deformed materials through hardness values.