Abstract: In order to study the relationship between the composite structure and sound insulation property of integrated hollow core sandwich composites, the glass fabric/epoxy resin composites with different heights, panel thicknesses and core structures were fabricated. The experiments for sound insulation property were carried out in a reverberation-anechoic chambers measuring system. The results show that the structure of glass fabric has an obvious influence on the sound insulation property of integrated hollow core sandwich composites. The sound properties of the composites increase gradually with the increase in height. The panel thickness has a greater impact on the sound insulation properties of the composites, and the effect of core structure is relatively weak. The sound insulation property of the composites with 8 shaped core structure is slightly higher than that of the composites with 88 shaped and X shaped core structure.