The electron thermal conductivity in the HT-7 tokamak is obtained by analyzing the electron power balance. In the HT-7 device, the electron thermal convection loss can be neglected, compared with ohmic input power, and the thermal conduction loss is the main energy loss mechanism. The electron thermal diffusion coefficient increases with the minor radius, and is about 100 times larger than the neo-classical theory calculation. After siliconization, the electron thermal diffusion coefficient decreases obviously at the outer half region, and the energy confinement time is prolonged.