Due to the restriction of strong basal texture, the formability of the thin magnesium alloy sheets at room temperature is insufficient, and its industrial application is greatly limited. Based on the mechanism of texture weakening of Mg alloy sheets, this paper highlights the feasibility and unclearly mechanism problems of shear induced twinning actviaiton to realize texture weakening of magnesium alloy sheets. Combined with the process development for activating twinning to weaken the texture of magnesium alloy sheets, the features and limations of shear contained technology in Mg alloy sheets are discussed. Given the undelying mechanism of slip and twinning actviaiton under complex stress and lacing of technology for shear-induced texture weakening of Mg alloys, An effective Schmid factor and an equal channel angular bending technology were proposed respectively, and the application of the new calculation theory and shear processing technology in Mg alloy sheets was presented.