Two typical binary metal hydrides, TiH2 and MgH2 were introduced into the RDX based explosive composites. Charges with different contents of metal hydride were evaluated through underwater explosion. Composite with 10% MgH2 exhibited the best shockwave parameters, peak overpressure, specific impulse and specific shock energy of which promoted by 5.7%, 7.0% and 8.4% respectively. Whereas, the specific bubble energy of composite with 10% TiH2 showed the maximum enhancement of 5.5%, and density specific energy of which increased significantly attributed to the large density of TiH2. Meanwhile, a 2-year ambient storage test of metal hydride reactants and RDX-metal hydride explosive composites was conducted to evaluate the safety and stability. X-ray diffraction (XRD), thermogravimetry (TG) and differential thermal analysis (DTA) were then conducted to analyze the aged samples. Results revealed that TiH2 and its explosive composites showed an excellent storage stability due to the formation of thin TiO2 film. Whereas, mass fraction of Mg(OH)(2) was found increasing with time in both MgH2 and its explosive composite, of which hydrolysis of MgH2 was the main mechanism. Moreover, Mg was found in aged MgH2 powder as a result of decomposition. The mechanical strength of aged charges of RDX based MgH2 explosive composite also degraded significantly ascribed to the released hydrogen.