The secondary recrystallization and its temperature range of grain oriented silicon steel have been studied by the method of interrupting secondary recrystallization annealing.The evolution of grain sizes and grain orientations during the slow heating process was determined by EBSD technique.The Goss oriented grains,their grain sizes and their misorientations to the surrounding grains were analyzed.The effects of grain boundaries with high energy or high mobility and surface atmosphere on the growth of Goss grains are discussed.