  By calculating entanglement measures and quantum violation of Bell-type
inequality, we reveal the relationship between entanglement measure and the
amount of quantum violation for a family of four-qubit entangled states. It has
been demonstrated that the Bell-type inequality is completely violated by these
four-qubit entangled states. The plot of entanglement measure as a function of
the expectation value of Bell operator shows that entanglement measure first
decreases and then increases smoothly with increasing quantum violation.
