The lack of plenty of gas products during the combustion reaction of thermite is an important constraint on the development of high energy. To make up for the lack of gas production and improve the reactivity of nano-thermite， Al@KIO₄ and Al@NaIO₄ nano-thermites with core-shell structure were prepared by spray drying method. Scanning electron microscope， X-ray diffractometer， thermal analyzer， constant volume combustion chamber， hygroscopicity test and initiation power test were used to characterize the morphologies and structures， and also thermal properties， combustion performances， moisture-resistance performances and detonation performances. Results show that Al@KIO₄ and Al@NaIO₄ nano-thermites are seperatelly in high purities and with regular morphologies； the heat release are 1262.12 J∙g^-1 and 1414.7 J∙g^-1， respectively； the starting temperatures of the decomposition reactions are lower than the raw materials and accompanied with a large number of oxidizing gas products. The mass balances were reached on the 6th and 10th day， and the mass gains were about 0.64% and 0.65% in high humidity for the Al@KIO₄ and Al@NaIO₄ nano-thermites. Initiation power test showed that 96 mg samples charged into No.8 industrial detonator as primary explosive could completely detonate RDX， the perforation diameter of 5 mm thick lead plate showed that the initiation capacity of Al@KIO₄ and Al@NaIO₄ nano-thermites were comparable to LA. According to the perforation diameters， the order of initiating power is LA＞Al@NaIO₄＞Al@KIO₄＞LTNR.