The variant selection of martensites (ε-M and α\'-M) and ε-M reversion in dynamic tensile high-manganese TRIP steel were investigated.α\'-M variant pairs with a zigzag morphology frequently formed,and the pairs of neighboring α\'-M variants were examined in terms of mechanical work and strain energy reduction.The occurrence of a primary α\'-M variant is determined by mechanical work,but high products of mechanical work and strain energy reduction are essential for secondary variant selection.In contrast to α\'-M variant pair selection,ε-M variant selection can be attributed to the highest mechanical work.During ε-M→α1\'-M transformation,the mechanical work of ε-M reversion is higher than that of α\'-M variant,thereby implying that ε-M reversion in γ grain is possible.ε-M plate distribution also affects the feasibility of ε-M reversion.