When multi-point explosions occur within a cylindrical shell containment， the generated multiple shock waves experience superposition and coupling， interact with the vessel walls to produce reflected waves， and ultimately resulting in a highly complex internal flow field. To investigate the flow field characteristics and the key influencing factors for multi-point explosions within a cylindrical shell， a two-dimensional plane-strain ring model was employed and studied. The results demonstrate that the evolution of the flow field exhibits periodic behavior. Specifically， when there are 2 explosion points， the reflected wave pressure at the observation points near the inner wall of the circular ring is significantly increased compared with that of the central single-point explosion. Especially when the distance from the explosion points to the center of the ring is 0.6 times the radius of the circular ring， this pressure value can reach up to 4.58 times that of the central single-point explosion. Shock wave coupling in configurations with two or three explosion points enhances structural deformation of the circular shell. However， as the number of explosion points increases further， the radial displacement of the shell gradually diminishes. Under conditions where the total explosive mass remains constant and the radial distance of the explosion points from the center is constrained between 0.2 and 0.8 times the shell radius， the two-point configuration induces the most significant structural deformation.