在低速撞擊中，複合材料圓管形試件的SEA值最高，比其他相同衝擊速度下的試件高出0.5 % - 18.32 %左右，而起落架的部分鋁合金圓管形起落架的SEA值最高，比其他相同衝擊速度下的起落架高1.56 % - 43.95%。在高速撞擊中鋁合金圓管形試件的SEA值最高，比其他在相同衝擊速度下的試件高出 2.22% - 10.23%，而起落架的部分複合材料圓柱形截面起落架的SEA值為最高，比其他相同衝擊速度下的起落架高約5.53 %-31.36%。 In recent year, global air traffic grows up quickly. Using composite material in main structure of airplane is the trend of aerospace industry. Composite material is lighter than metal and as well as has higher strength and higher toughness. But there is doubt about its capability during impact loading. Therefore, we used varies loading rates and different sample configurations to compare the energy absorption characteristic between metal and composite material. The response of metal and composite material light aircraft landing gear under dynamic loading was also investigated in the article. We used Pro-E to establish the 3-D model and used Abaqus/Explicit to simulate the dynamic analysis. The results were verified by the balance of total energy and amount of artificial strain energy. We use the carbon fiber reinforced composites and 6061-T6 aluminum alloy material, loading condition of ASTM, FAR and AGATE to be a loading condition of the simulation. Build the model of sample and landing gear by Pro/ENGINEER and simulate the dynamic energy absorption by Abaqus/Explicit. We verify the result of simulation by Total Energy and Artificial Strain Energy. The SEA of composite tube-shaped sample is higher than other sample 0.5 %~18.32% and landing gear of aluminum cylinder-shaped is higher than other landing gear 1.56%~43.95% in the same low velocity. The SEA of aluminum tube-shaped sample is higher than other sample 2.22%~10.23% and landing gear of composite cylinder-shaped is higher than other landing gear 5.53%~31.36% in same high velocity.