Abstract: The loading characteristics of pored flat structure was investigated near the explosive in the cylinder space by adopting the multi-material Euler and fluid-solid coupling arithmetic with the help of LS-DYNA3D software.The flow filed around the pored flat structure near the explosive,and the relation between effective impulse of the flat and the pored position or the loading history were analyzed.Finally,the shock wave reflectance Pr/Ps was calculated.