<p>As a common structure in the material medium, the heterogeneous interfacial structure redistributes the stress field after the explosion stress wave acts on the material, which is easy to cause damage or even fracture of the material. In order to study the evolution process and distribution characteristics of strain field in media with heterogeneous interfaces under different initiation modes, an ultra-high-speed digital image correlation experimental system was established. Chloroform bonded polycarbonate (PC) board and polymethylmethacrylate (PMMA) board were used to construct heterogeneous interface structure. By changing the position of initiation point in PC board, the initiation point near the interface end was defined as hole bottom initiation. When the interface is far away from the end of the hole, the dynamic response characteristics of the explosion stress wave through the heterogeneous interface media are studied. The experimental results show that the interface has different hindering ability to stress waves under different initiation modes. The cracking phenomenon of the interface is macroscopic when only the opening is used, which is mainly due to the stress concentration area formed at the interface due to the action of reflected transverse tension waves. The contribution of detonation mode to the tensile and compressive strain field of PMMA medium is different. The influence on the transverse compressive strain field is mainly reflected in the strain field strength, while the influence on the longitudinal tensile strain field is mainly reflected in the strain field strength and strain zone morphology distribution. Under different initiation modes, the absolute value of the attenuation index in PC medium is greater than that of PMMA when it is close to the end of the gun hole, and the PMMA is larger when it is far away from the end. The difference is shown in the distribution of strain attenuation index in different media.</p>