Abstract: The qnantum interference effects on thermoelectric coefficients in the small size sample are discussed in this paper. Assuming that the electron-electron interactions and the inelastic scatterings are weak and using a corrected Wiedemann-Franz relation, we could obtain the function dependance of the relative thermal conductivity on the relative electric conductivity. The result shows that the thermal conductivity exhibits periodic fluctuation corresponding to the electric conductivity flnctuation, but that the amplitude is lower.

Key words: mesosoopic systems, thermal conductivity, electric conductivity