To investigate the sensitivity characteristics of an perchlorate-based ECSP containing aluminum, metallic and non-metallic perchlorate-based ECSP with various Al content (0%, 5%, 10%, 15% and 20%) and particle size (0.05, 5, 25, 65 µm and 105 µm) were prepared by means of the casting process; the impact, friction, electrostatic spark, and flame sensitivities of the perchlorate-based ECSP were investigated according to the national military standard methods. The results show that the impact sensitivity of the perchlorate-based ECSP increases with the increase of the aluminum content and decreases with the increase of the particle size of the aluminum powder in the propellant. The metallic and non-metallic perchlorate-based ECSP show low friction sensitivity. The changes of the Al content and particle size have some influence on the friction sensitivity, but the effect is slightly presented. The flame sensitivity of the perchlorate-based ECSP decreases with the increase of the particle size of the aluminum powder. Under the test voltage of 10 kV, the changes of content and particle size of the aluminum powder do not result in obvious combustion of perchlorate-based ECSP. The impact sensitivity is larger for nano-ECSP (H₅₀=33.9 cm) than in the perchlorate-based ECSP with the micro-aluminum powder (H₅₀≥33.9 cm).