Abstract: The multidisciplinary study of nanosciences using radiochemistry as probes is not only the application of radiochemistry in nanosciences, but also the development of radiochemistry itself. We report here a new method for synthesis of all-carbon fullerene dimmers, established with neutron irradiation of fullerenes, including the experimental design, neutron irradiation, separation and isolation, and characterizations. With irradiation of nuclear reactor neutrons, we have established a method for syntheses all-carbon fullerene dimers, C121, C131, and C141 that are difficult to produce by chemical approaches. The results may open a way for syntheses of fullerene dimmer, trimer, or even polymer materials which have promising appliacations in various field like artifical photosynthesis, molecular device and supermolecular chemistry, etc.