<p>Due to the transient nature of the blasting process and the complexity of the blasting effect, the number and spatial distribution of detonation points significantly affect the intensity and damage distribution of the strain field in the medium. Based on this, this paper studies the time-varying effect of the spatial position of the detonation point on the strain field and the damage distribution using the digital image correlation method and LS-DYNA numerical simulation. The results indicate that the influence of the number of initiation points along the gun hole on the strain field primarily manifests in the characteristics of strain history and the intensity distribution of the strain field. The axial strain and radial strain exhibit a single peak distribution pattern at a single-point initiation, with the strain intensity gradually increasing in the direction of detonation. In contrast, the strain intensity at two-point initiation exhibits a double peak distribution pattern and presents a symmetrical distribution along the center of the gun hole, significantly enhancing the strain field intensity at the center of the two initiation points. The experimental results of the two-point initiation model are corroborated through the numerical simulation. In general, the damage length can be divided into four expansion stages based on the distance between initiation points. When the distance between the initiation points reaches a certain extent, the damage length at the central position peaks and is no longer influenced by the distance between the initiation points. The damage degree in the center area of the gun hole accurately represents the total energy of the area, and the two physical quantities demonstrate a positive correlation.</p>