  The global spin alignment of the vector meson has been observed in
relativistic heavy ion collisions, but is still on hot debates in the
theoretical community. Here we propose to apply the light front framework to
explain this phenomenon since the light front form explicitly describes the
hadron spin including both the quark spin and the orbital angular momentum.
After applying the light front spinor, we find that the spin alignment in the
polarization of vector mesons with $\rho_{00}>1/3$ can be naturally manifested
and in particular, the obtained spin alignment for $\phi$ meson is in good
agreement with the experimental data. This implies that to explain the spin
alignment it is important to properly include the contribution from the gluon
interactions that are presented in terms of the orbital angular momentum of the
hadron bound state.
