  I discuss the elliptic flows of $\psi(2S)$ with different production
mechanisms in $\sqrt{s_{NN}}=2.76$ TeV Pb-Pb collisions. If the final
$\psi(2S)$s are mainly from the recombination of uncorrelated charm and
anticharm quarks at $T\approx T_c$, charm and anticharm quarks will carry large
collective flows of the bulk medium, which will be inherited by the regenerated
$\psi(2S)$s. This indicates a larger elliptic flow of $\psi(2S)$ than that of
$J/\psi$ which can be regenerated at $T\ge T_c$, $v_2^{\psi(2S)}>v_2^{J/\psi}$.
However, if the final $\psi(2S)$s are mainly from the transitions of
$J/\psi\rightarrow \psi(2S)$ caused by the color screening of QGP, its elliptic
flow should be close to the elliptic flow of $J/\psi$, $v_2^{\psi(2S)}\sim
v_2^{J/\psi}$. Therefore, $\psi(2S)$ elliptic flow is a sensitive probe for its
production mechanisms in relativistic heavy ion collisions.
