The orientation evolution of Mg alloy grains was in-situ tracked during compression at 100℃ by the electron backscatter diffraction（EBSD）method

meanwhile

quantitative analysis was also conducted on activations of slips and twinning.Effects of extension twin activation on slips activations were analyzed during deformation based on calculation of variations of Schmid factor（SF）for different slips before and after twinning.The results reveal that there are absence of distinct changes for Schmid factor of basal slips before and after twinning for Mg alloy grains with basal textured orientation

while the Schmid factor of prismatic slips is decreased distinctly after twinning and it is difficult to be activated during the subsequent deformation.In addition

the Schmid factor of pyramidal slips is increased distinctly after twinning

and it is relatively easy to be activated during the subsequent deformation.