Following the discoveries of the giant atomic clusters (GACs) induced mechanism in a series of twinning modes in hexagonal close-packed (HCP) crystals, the law of atomic motion in {10\bar{1}4} twinning is successfully revealed in this paper by using the GACs rotation model. It is found that the GACs in {10\bar{1}4} twinning (for magnesium) rotate by an angle of 20.2° without making a shifting along the longitudinal direction of the clusters. As an important parameter to judge the difficulty degree of a twinning mode to occur, the value of the relative displacement magnitude (RDM) among the adjacent atomic clusters in {10\bar{1}4} twinning (0.845a) is significantly larger than that in {10\bar{1}2}, {10\bar{1}1} and {10\bar{1}3} twinning. The discovery of the GACs induced mechanism in {10\bar{1}4} twinning in return consolidates the applicability of this mechanism in the HCP crystals.