The texture formation mechanism during high temperature deformation is investigated on AZ80 magnesium alloy. Three kinds of specimens with different initial textures were machined out from rolled plate having a ©0001ª texture. Plane strain compression tests were conducted at 723 K, 5.0 © 10 ¹2 s ¹1 and strains ranging from ¹0.4 to ¹1.0. Development of ð0001Þh10 " 10i component is confirmed regardless of the initial texture. It is concluded that the development of ð0001Þh10 " 10i component can be attributed to the grain boundary migration during deformation. Besides ð0001Þh10 " 10i component, several texture components appeared depending on the initial texture.