  The latest results on the measurement of the properties of the new boson with
mass around 125 GeV are reported. The analysis uses pp collision data recorded
by the CMS detector at the LHC, corresponding to integrated luminosities of 5.1
$fb^{-1}$ at $\sqrt{s}$ = 7 TeV and 19.6 $fb^{-1}$ at $\sqrt{s}$ = 8 TeV. The
boson is observed in the $H \to ZZ \to 4\ell$ channel ($\ell = e, \mu$) and its
mass is measured, giving the most precise result ever achieved. Moreover, the
first experimental constraint on Higgs total width using $H \to ZZ \to 4\ell$
events is presented, setting an upper limit of 33 MeV at 95\% confidence level
(42 MeV expected). The spin-parity of the boson is studied and the pure scalar
hypothesis is found to be consistent with the observation, when compared to the
other spin-parity hypotheses. No other significant Standard Model Higgs-like
excess is found in the search and upper limits at 95\% condence level exclude
the range 129.5 -832.0 GeV.
