Abstract: Multi-walled carbon nanotubes (MWNTs)epoxy nanocomposites were prepared for the first time by -ray radiation curing. The gel contents, the conversion rates and heat flow curves were determined by the Soxhlet extraction method, Fourier transform infrared spectrum (FT-IR) and differential scanning calorimetry (DSC) technique, respectively. Scanning electron microscope (SEM) was used to observe the microstructure of the composites. The gel content of the composites prepared by γ-ray radiation curing increased with the increase of radiation dosages and photoinitiator concentration. Because of the effect of MWNTs on the reactive centers, the conversion tended to decrease in the beginning and then increase with the increase in the amount of additional MWNTs. Higher amount of MWNTs may lead to aggregation in the system, which may cause the curing behavior to deviate from that of neat epoxy.