A novel biphenyl epoxy monomer of p-methyl phenylhydroquinone epoxy resin (p-MEP) was synthesized and characterized. We researched its potential in the area of thermal conduction application and prepared a series of hybrid composites based on it with different mass ratios of sphere Al 2 O 3 filler. From the good mobility and low viscosity of p-MEP, it allowed mixing with more Al 2 O 3 fillers. The hybrid epoxy resins owned the advantages of traditional epoxy resins as well as quite considerable thermal conductivity. Therefore, the hybrid composite at the maximum mass fraction of 70% possess the highest thermal conductivity of 5.6 W mK −1 , which is 5.6 times higher than that of pristine p-MEP (0.1 W mK −1 ).