Abstract: Boron-containing green ore in the eastern area of Liaoning Province of China, boron-containing iron ore concentrate and boron-rich slag were used as starting materials to prepare boron-containing composites. Monte-Carlo method was used to study the shielding properties of boron-containing ore/epoxy composites with different proportions for slow neutrons of 1 keV, 1 eV, 0.0253 eV energy respectively and the factors that affect the shielding abilities, and comparison with shielding materials of Portland cement concrete was also conducted. The results show that the shielding properties of the composites for 1keV neutron increase with the increase of hydrogen content in the composites. The shielding performance of the composites for 1eV neutron is mainly related to boron content and the ratio of boron to hydrogen in the mixture. Boron content is the main f actor that affects the shielding properties for 0.0253 eV neutron. The slow neutron shielding properties of all composites are stronger than Portland cement concrete and the boron-containing ore/epoxy composites are expected to improve the shielding properties of Portland cement concrete. This may provide the basis for the design of slow-neutron shielding.