  Evolution of electron temperature, electron density and its fluctuation with
high spatial and temporal resolutions are presented for the cold pulse
propagation induced by super-sonic molecular beam injection (SMBI) in ohmic
plasmas in the EAST tokamak. The non-local heat transport occurs for discharges
with plasma current $I_p$=450 kA ($q_{95}\sim5.55$), and electron density
$n_{e0}$ below a critical value of
$(1.35\pm0.25)\times10^{19}~\mathrm{m^{-3}}$. In contrary to the response of
core electron temperature and electron density (roughly 10 ms after SMBI), the
electron density fluctuation in the plasma core increases promptly after SMBI
and reaches its maximum around 15 ms after SMBI. The electron density
fluctuation in the plasma core begins to decrease before the core electron
temperature reaches its maximum (roughly 30 ms). It was also observed that the
turbulence perpendicular velocity close to the inversion point of the
temperature perturbation changes sign after SMBI.
