This paper presents an overview of research status in global sea-level changes since the last deglciation, its changes in Holocene is a key topic. The causes responsible for sea-level variations are given at first, and then the paper describes the impacts caused by sea-level changes, and summarizes the methods for analyzing sea-level variations. Sea-level elevation as well as eustatic sea-level curves reconstructed by different scholars are given, and the problems in the study of sea-level change are briefly summarized.