The measurements of the second-harmonic extraordinary mode electros cyclotron radiation emitted perpendicularly to the magnetic field, in the CT-6 Tokamak are presented. The dependence of electron temperature at r≈0 on the time of discharges and radial profiles of electron temperature were obtained. The strong radiation of runaway electrons and the MHD temperature fluctuation with sawtooth oscillation in the CT-6 Tokamak descharge were also observed