Convective heat transfer behaviors of layered corium pools under motion conditions have been recently motivated by the need of safety analysis for marine reactors. In this paper, heat transfer characteristics and stratification behaviors inside layered corium pools under oscillating conditions were investigated through visualization experiments. The test section to simulate corium pools takes the shape of a semi-ellipsoidal slice, measuring a span of 1.2 m, a total pool depth of 0.32 m and a thickness of 0.2 m. In the experiments, fluorinert liquid FC-40 and water were chosen respectively as simulant of the oxide layer and the metal layer. Based on experimental results, the temperature stratification of corium pools was generally weakened under oscillation conditions, together with the increased heat transfer capacity to the cooling wall. And this effect became more obvious with the increase of oscillating frequency or oscillating acceleration, which can be quantified by the new-defined dimensionless number Lo. Besides, it was found that the effect of oscillations in vertical direction was more intense than that of oscillations in lateral direction given a same large Lo number representing high-intensity oscillation. For the former case, the two fluids were totally mixed up inside the test section, and the layered system could basically be regarded as a single-layer one. While for the latter case, although macroscopic deformations were observed in the interface between the two-layer fluids, the stratification of layered system was still maintained. By contrast, in case of a same small Lo number indicating low-intensity oscillation, the effect of oscillations in vertical direction on the behaviors of both heat transfer and fluid stratification could be ignored. However, the oscillation effects were still notable during lateral oscillation despite its low intensity. This research may provide references to the safety analysis of layered corium pools inside the marine nuclear reactors during severe accidents.