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Summary We report a detailed inves3ga3on of the(sub)structure of the Galac3cthin disk,based on 0.12 million A stars selected from the LSS-GAC DR3.We find:– Strong stellar flaring of the Galac3c young disk:much stronger than thatfound by other tracers;Northern disk different from Southern disk– N-S asymmetry:the "bending mode" perturba3ons– The overdensity of the Perseus Arm