In order to verify the validity of the rank-1 connection model of kink band, a comparison between the kink described by the rank-1 connection and the kink actually formed in LPSO-Mg alloy was made in this study. Crystal rotation and kink interface (v_k) of kink bands formed by almost single basal slip were analyzed by EBSD and double trace analysis. Theoretical kink interface (n_α) was computed using the experimentally acquired crystal rotation of the kink bands using the rank-1 connection model. A comparison was made between n_α and v_k. Theory and experiment showed agreement within 4°, indicating that the geometry of the kink band is well described by the rank-1 connection.