Two kinds of emission hexagonal patterns with different spatio-temporal symmetry are observed in lower and higher applied voltage range respectively by using a dielectric barrier discharge device with water electrodes. The spatial wavelength and filament diameter of the hexagon in higher applied voltage range are larger than that in lower voltage range. The hexagon in higher applied voltage range has a brighter background，while no background exists in the hexagon in lower applied voltage range. The spatio-temporal dynamics of the two kinds of hexagon patterns is investigated. It is found that the hexagonal pattern in lower voltage range is an interlacing of two rectangular sublattices, which have a time sequence inversion behavior. The filaments in the hexagon in higher voltage range discharge simultaneously. The influence of the wall charges on the spatio-temporal dynamics of the emission patterns is discussed.