  In this paper, we study the $\alpha$th power monogamy properties related to
the entanglement measure in bipartite states. The monogamy relations related to
the $\alpha$th power of negativity and the Convex- Roof Extended Negativity are
obtained for N-qubit states. We also give a tighter bound of hierarchical
monogamy inequality for the entanglement of formation. We find that the GHZ
state and W state can be used to distinguish the $\alpha$th power the
concurrence for $0<\alpha<2$. Furthermore, we compare concurrence with
negativity in terms of monogamy property and investigate the difference between
them.
