FAE cloud was limited by many factors. In this paper, based on experiments, influence characteristics of shell materials, specific central explosive and the ratio of height to diameter were studied. Some results indicated: steel shell is propitious for the radial dispersion of cloud, proper specific central explosive can form optimized cloud dimension and adjust the inner concentration of cloud, and the ratio is not the main influencing factor on the final cloud status. These results possessed important application value in device design and improving power of FAE.