Abstract: In order to improve the properties of polysiloxane-zinc dimethylate (ZDMA) resin, the short-cutted aramid fiber of general type was blended with polymethylvinylsiloxane-ZDMA compounds and cured at high temperature and pressure, and then the short-cutted aramid fiber/polysiloxane-ZDMA composites were gotten. The structure of short-cutted aramid fiber/polysiloxane-ZDMA composite was characterized by SEM and IR spectroscope, tensile and compressive properties were tested, the effects of the aramid fiber dosages and strain rates on the dynamic compression were also studied. The results show that the flowing property of the short-cutted aramid fiber/polysiloxane-ZDMA composites is affected by the short-cutted aramid fiber, which is not easy to disperse uniformly; the composite’s uniformity is not good at entirety. The fact is found that the fibers tends to aggregate together while the fiber dosage increasing, which causes the mechanical properties to fluctuate. The introduction of the aramid short fiber can improve the tensile strength and compressive stress of the short-cutted aramid fiber/polysiloxane-ZDMA composites, while its elongation at break decrease sharply. At the strain rate of 800 s⁻¹, the addition of the aramid fiber shows no significant influence on the dynamic compressive property. While in the strain rate range of 1500-2500 s⁻¹, the dynamic compressive stress of short-cutted aramid fiber/polysiloxane-ZDMA composites increases with the dosage of aramid short fiber. The polysiloxane-ZDMA composite without aramid fiber is relatively sensitive to the strain rate, while the dynamic compressive properties of short-cutted aramid fiber/polysiloxane-ZDMA composites with 8% mass ratio of aramid short fiber to polysiloxane are rather steady to the strain rate range of 1500-3000 s⁻¹.