This book provides an overview of the current situation and development trends in nuclear fuels and materials used in nuclear energy generation. The following contents are included in the book: * Fuels with different types, including oxide fuels, metal and alloy fuels, carbide fuels, nitride fuels, composite fuels and transmutation targets; * Fuels used in advanced reactor systems, including high temperature gas cooled reactor fuels, molten salt reactor fuels, sodium cooled fast reactor fuels, lead cooled fast reactor fuels, gas cooled fast reactor fuels, and supercritical water reactor fuels; * Materials used in nuclear reactors, including structural alloy materials, control rod materials and graphite materials; * Numerical simulation of advanced nuclear fuels; * The frontier of nuclear fuels, including new accident tolerant fuels, nano materials used in advanced nuclear energy systems.