Aluminized explosives have been widely applied due to their high energy density and pressure output. To further enhance the secondary combustion reaction and pressure output of aluminized explosives， graded structure is designed inspired by the microstructure of bamboo. In this work， the radially-graded structured HMX/Al （RGS-HMX/Al） cylinders with three layers containing different sizes and content of Al were prepared through 3D direct writing technology. The effects of Al distribution on combustion and pressure output properties of graded HMX/Al were fully studied. For the RGS-HMX/Al cylinder with Al content of 10%， 20%， and 30% distributed from inner to outer layer， the combustion reaction and flame propagation of inner layer were faster than that of outer layer. And the pressure （2337.61 kPa） was higher than that of RGS-HMX/Al cylinder with Al content in the reverse distribution. For the RGS-HMX/Al cylinder containing Al of 10 μm， 5 μm， and 160 nm distributed from inner to outer layer， a slow combustion process with sparse bright Al droplets was observed. Moreover， the highest peak pressure （1512.65 kPa） was obtained for the RGS-HMX/Al cylinders with nAl in the middle layer， which exhibited much higher pressure output than that homogeneous HMX/Al cylinder. More importantly， bimodal pressure was observed for the RGS-HMX/Al cylinders with Al of 10 μm in the middle layer.