Amethod for determining heat transfer coefficients and the effective thermal conductivity in a nonisothermal and nonadiabatic fixed-bed reactor has been proposed. By using the temperatures experimentally measured at several points in the fixed-bed and the outside wall of the reactor, the overall heat transfer coefficient(h_t), the inside wall heat transfer coefficient(h_w), and the effective thermal conductivity(k_er) were calculated on the assumption that the system is pseudo-homo-geneous. The system has been analyzed one-dimensionally for h_t and two-dimensionally for h_w & k_er, respectively. The coefficients obtained in the temperature range of 200-300℃ for the reactor of 4" diameter were found to be different for heating or cooling. Nevertheless, the temperature distributions in the reactor simulated with the obtained coefficients were in a good accordance with the experimental observations. The effect of fluid convection in the fixed-bed according to heating or cooling on ke_r was also discussed. The method proposed in this study can be very effectively used in determining the coefficients and predicting the temperature distribution in an industrial fixed-bed reactor without any additional system or instrument.