Based on the principles of tectonic sequence analysis and base-level analysis and high-resolution seismic sections , log curves and lithofacies data, this research is focussed on the depositional characteristics of the lowstand sand bodies of three sequences of the third member of the Shahejie Formation in the Dongying depression and their development rules and the significance in petroleum geology. The concept of structural break zone is used in this paper, and four structural break zone styles have been identified. The research shows that the lowstand sand bodies of the third member of the Shahejie Formation in the depression consist of incised channel deposits, lowstand wedges, and lowstand fan deposits. The development characteristics and styles of the structural break zones control the distribution of the lowstand sand bodies. The lowstand sand bodies controlled by structural break zones are developed in the lower part of the sequences and near the structural break zones. They are favourable for oil bearing, so that the lowstand sand bodies are prospect districts for subtle reservoirs.