By high-speed air flow circulation, a porous Mn-based metal-organic framework (Mn-BTC) was prepared from manganese acetate tetrahydrate and trimesic acid in the condition of the solid phase at low-temperature. The Mn-BTC was characterized by X-Ray diffraction (XRD) technique, IR spectroscopy (FTIR), thermogravimetric analysis (TG) and scanning electron microscopy (SEM). Moreover, an easy route for the synthesis of Mn2O3 by direct pyrolysis of Mn-BTC was also reported. The catalytic effect of Mn2O3 on the decomposition of AP was studied in detail. The results showed that the time for the synthesis of Mn-TBC by high-speed air flow could be reduced to 10 min, while the time for the diffusion in liquid phase was 24 h. In addition, the process of high-speed air flow method is easy to operate, low energy to cost, high efficiency to synthesize and also friendly to environment, which are benefit to this method to be industrialization. Compared to the product from the liquid phase diffusion’s precursor, the Mn2O3 prepared by the high-speed air flow method’s product, has better effect to catalyze the AP and can make the high thermal decomposition temperature (HTD) reduce by 158 ℃.