Abstract: Boehmite (AlOOH) nanorods were prepared by hydrothermal method and modified by 3-aminopropyltriethoxysilane (APTES) to obtain modified boehmite (mAlOOH). Then, AlOOH/epoxy (EP) and mAlOOH/EP composites were fabricated by using the EP as the matrix. The effects of the contents of AlOOH and mAlOOH on the properties of the AlOOH/EP and mAlOOH/EP composites were systematically studied. The results show that the mechanics properties of mAlOOH/EP composites are obviously improved by mAlOOH. The impact strength and flexural strength of 4wt% mAlOOH/EP composites are increased by 259% and 44% than that of neat EP, respectively. Both dielectric constant and dielectric loss of mAlOOH/EP composites are slightly lower than those of the pure EP with mAlOOH no more than 5wt%. The mAlOOH/EP composites with 3wt% mAlOOH exhibit excellent global properties with the lowest dielectric constant and the lowest dielectric loss, as well as the highest glass transition temperature (123℃).