Abstract: The high spatial resolution and multi-energy point diagnostic technology explores the core zone for ICF implosion on SG-Ⅲ prototype device. With the reflective properties of double-periodic multi-layer KB, bremsstrahlung radiation characteristics of implosion can be divided into three energy points. Three energy points images are recorded separately by multi-level recording medium, including a three-layer film and CCD. The experimental results show that 2.5 keV, and 3.5 keV clear images can be obtained using the films, and a 8 keV clear image can be obtained using the CCD. The results can be used for core analysis and processing of asymmetry, electron temperature and density distribution, The multi-level recording technology and the experimental technique based on multi-layer KB provide new diagnostic technique for ICF precision physics experiments.