• An experimental platform including a test section and a helium loop was designed to measure the ETC. • The uncertainty of the measured values combining standard uncertainties isaround 5.5 % for a level of confidence of 95 %. • An increase of the ETC of the Li 2 TiO 3 and the Li 4 SiO 4 pebble bed was detected in the temperature range RT-400 °C. • The ETC of binary glass pebble beds in helium and air at room temperature is strongly dependent on the packing factor. The lithium ceramic pebble bed is a vital functional component of solid blankets in fusion reactors to realize tritium breeding. The effective thermal conductivity of the lithium ceramic pebble bed is a key thermal property which has a significant impact on the design and analysis of the fusion blanket. An experimental platform including a test section and a helium loop was designed to measure the effective thermal conductivity. The test section was based on the principle of the hot wire method and the helium loop was designed to satisfy different experimental conditions. For the Li 2 TiO 3 and the Li 4 SiO 4 pebble bed, experiments were performed in the presence of stagnant helium at atmospheric pressure. An increase of the effective thermal conductivity was detected in the temperature range RT-400 °C and the results were compared with numerical results. For the binary glass pebble beds with different diameter ratios, experiments were performed at room temperature in the presence of stagnant helium and air. The effective thermal conductivity was found strongly dependent on the packing factor.