Flow Phenomena in CMS.

This proceeding reports the measurement of azimuthal angle correlations of charged hadrons in $\sqrt{s_{NN}} = 2.76$ TeV Pb+Pb collisions by the CMS experiment.The second order harmonic, elliptic flow $v_2$ was shown as a function of transverse momentum ($p_{T}$) and centrality in a broad kinematic range.Various methods were employed to extract the signal strength of the harmonics the event-plane method, cumulant, Lee-Yang Zeros and di-hadron correlation method.Higher order harmonic results, $v_3$ from event-plane method and $v_3$, $v_4$, $v_5$ and $v_6$ from di-hadron correlation methods were also shown.The results indicate that higher order harmonics are mainly dominated by initial state fluctuations.Neutral particle $\pi^0$ elliptic $v_2$ results and high $p_T$ up to 60 GeV/$c$ particle elliptic $v_2$ results are also shown.The di-hadron correlation results of $v_2$ and $v_3$ in $\sqrt{s_{NN}} = 5.02$ TeV p+Pb collisions are presented, which give more open questions.