Electron temperature profiles,the normalized temperature gradient length and the electron heat diffusivity calculated by the heat pulse transfer method in a plasma confinement region,are investigated during electron cyclotron resonance heating(ECRH)in an HL-1M tokamak.The electron temperature profiles remain almost constant.The normalized temperature gradient length is in the range of 7-13.Electron heat diffusivity in the ECRH plasmas is larger than that in the ohmically heated plasmas.Electron heat diffusivity during off-axis(p ＜ 0.3)ECRH discharge is similar to that during on-axis ECRH discharge.