中文摘要：

根据南海地形地貌、地质地球物理剖面贤料、重磁场异常、地元结构特，仕和岩白圈动力字耶境，对雨海新构造运动起始时限进行了新的解释。传统的观点是把新近纪作为新构造下限，依此观点，南海地区在古近系、新近系之间应为不整合接触，但在此阶段并没有发生重大变革的构造事件。而符合南海地区准平原化阶段的时代是在中中新世末至晚中新世（N1^2／N1^3）之间，在此时段普遍存在区域构造不整合接触和地层缺失、断裂、变形及火山活动等构造变动事件。本文把中中新世末作为南海地区新构造运动开始的时间。通过对南海地区中中新世末至晚中新世之间的构造变动事件的对比研究，可以看出新构造运动在不同地点有时间和强度的差异性、构造运动的差异性、沉积相和沉积建造的差异性等特征。

英文摘要：

Based on the topography, geophysical profiles, gravity and magnetic anomalies, structural characteristics and crustal dynamic environment, the paper illustrates the epoch and diversities of the neotectonic movement in the South China Sea. The traditional point looks the late Tertiary as the beginning of the neotectonic movement in the South China Sea. So as this view, the stratum between early and late Tertiary should be unconformable. But there are no many tectonic events during this period. From middle Miocene to late Miocene there is a stage of peneplanation in the South China Sea and there are many tectonic events in this area, such as stratum unconformable contact, faults, deformation and magmatism. So we think the neotectonic movement in the South China Sea begins in middle Miocene. By contrasting the tectonic event between the middle Miocene to late Miocene in the South China Sea, we can see the neotectonic movement has distinct characteristics in different area.