The high-speed framing photography was applied to observe the shell distorting,expanding fracture mechanism of different thickness shell driven by detonation,and jet forming,developing process of explosion scattering. Scanning electron microscopy (SEM) photographs of fractures in axial and circumferential directions for different thickness fragments were obtained. There are different fracturing modes of the two thickness shells from macroscopic analysis and the collected fragments. Results show that the fragments of 3 mm thickness shell are much bigger,longer and less than that of 1.5 mm. SEM analysis of fragments section show that their formation is mostly caused by the shear fracture. And jet fracturing process of explosion scattering can be divided into three stages: integral injection,interface appearing in flocculent and breaking,small water droplets forming.