Hexahydro-1,3,5-trinitro-1,3,5-triazine/ammonium perchlorate/glycidyl azide polymer (RDX/AP/GAP) intermolecular explosives (IMX) with different proportions of RDX to AP were prepared by sol-gel method, and the structure and performance was characterized by Brunauer-Emmett-Teller measurements (BET), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The results showed that the specific surface area of RDX/AP/GAP IMX decreased with the addition of AP. The crystals of AP and RDX in RDX/AP/GAP intermolecular explosives were in the range of 20-48nm and 23-55nm, respectively. In addition, RDX/AP/GAP intermolecular explosives had the largest heat release at zero balance.