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In this paper, the Aowitt-Deser-Misner (ADM) constraint equations are naturally derived in two differentways. One method is to construct a one-parametric gravitational action in the Lorentzian spacetime. Hence, the one-parametric ADM constraint equations can be obtained. The other method is to apply the double complex functionmethod to Einstein-Hilbert gravitational fields in HamiItonian formulation. Therefore the double ADM constraintequations can be obtained, in which the well-known ADM constraint equations are included as a special case.