As light-sensitive molecules is included in it, photo-responsive polymer (PRP) undergoes macro-scale shape change under light irradiation, which renders PRP a promising material for long-range actuation such as circuit-less actuator and self-morphing structures. In order to understand photo-deformation of the photo-responsive polymer, the underlying physics scaled from subatomic quantum interaction to macroscopic displacement would be required. Herein, we suggest a concurrent multiscale methodology which describes an opto-mechanical nature of PRP. This model covers a broad range of physics from quantum level photo reaction of the molecule to conformation effect imposed on nearby elastomer chain. For detail explanations, different problems and solving techniques are proposed for each scale. The information obtained from each scale are transferred to one scale to another based on scale-bridging method. Through this multiscale platform, we can understand not only comprehensive phenomena of PRP deformation, but also can get the possibility to perform efficient material designs for future applications.