The formation of soil arching effect and load transfer mechanism are the key technological problems for analyzing pile-soil interaction in piled embankment. In order to research the evolution process of macroscopic soil arching effect morphology, the photoelastic experiment technology is applied and realizing stress visualization in piled embankment model by using a locally developed loading device and optical measurement mechanics image processing system. The rules of generation, distribution and changes of the force network can be directly observed. Then based on comparatively analyzing the pile-soil stress ratio obtained from experiment and finite element numerical simulation, it is shown that the soil arching shape transforms from triangle to semicircle; and pile-soil stress ratio decreases gradually when reducing the height-span ratio. When the ratio of filling height to pile spacing, , is greater than 1, full soil arching is observed; when , the effect of soil arching begins to disappear.