Effects of asynchronous rolling routes on microstructure and properties of AZ31 magnesium alloy sheets have been described. The results show that the microstructure of the sheets with fine grain about 20μm in grain size and little twin crystal can be observed

and the elongation of the sheets reach 26% with higher yield strength and strain-hardening index when it is rolled with rotating direction of 180°per pass and the constant normal direction

while the maximum plastic strain ratio can be observed when it is rolled with rotating direction of 180°both per pass and normal direction

showing complicate effects of asynchronous rolling routes on properties of the magnesium alloy sheets. The comprehensive effects of asynchronous rolling routes should be fully considered and optimized to improve the drawability of AZ31 magnesium alloy sheets.