海岸线动态变化反映了海陆边界的进退过程，对沿海地区环境保护与发展规划有重要意义。本研究在惠州市1973-2019年间6期Landsat卫星影像的基础上，利用人机交互式解译的方法获取6期海岸线数据并统计其长度和类型的变化。在数字化岸线系统（DSAS）中对净移动距离（NSM）、变化率（EPR）以及线性回归率（LRR）进行分析，探讨海岸线动态变化中的潜在驱动因素。结果表明，1973-2019年期间，惠州市海岸线的总长度由224,565m增加到249,656m，平均NSM为185.46m，平均EPR为4.04m/a。1973-1984年海岸线总体表现为侵蚀特征，1984年以后总体呈趋势，其中1984-1993年扩张幅度最高，NSM达到100.2m。此外，不同岸线类型中人工岸线变幅最为明显（8.27%~57.45%），以大亚湾石化区、范和湾北岸围垦养殖段、惠州港、考洲洋段西部围垦养殖段以及临近黄埠镇段等区域为主。其变化原因主要有沿海养殖业的发展，港口、工业区和滨海旅游区的建设以及人口增长和经济发展需求下的建筑用地扩张。部分自然岸线段如巽寮湾段核心旅游区、双月湾东岸和西岸则在整个研究时间段内保持稳定。研究表明人为因素是惠州市近50年来海岸线变化的主要驱动因素，自然因素对海岸线变化影响较小。与整个中国大陆海岸线变化速率相比，惠州市的变化速率并不高。从近期，即2013-2019年的变化率来看（EPR为2.51%），惠州市海岸线变化趋于稳定，预计未来一段时间内不会大范围向海扩张。

The dynamic changes of the coastline reflect the transgression-regression process of the sea-land interaction, which is of great significance to the environmental protection and development planning of coastal areas. On the foundation of 6 periods of Landsat satellite images from 1973 to 2019, this paper obtained coastline data of each period and calculated the changes both in its length and type by means of human-machine interactive interpretation. Detailed analysis in terms of Net Shoreline Movement (NSM), the End Point Rate (EPR) and the Linear Regression Rate (LRR) in the Digital Shoreline Analysis System (DSAS) were conducted to explore the potential driving factors regarding the dynamic changes of the coastline. The results show that from 1973 to 2019, the total length of coastline of Huizhou increased from 224,565m to 249,656m, with an average NSM of 185.46m and an average EPR of 4.04m/a. The coastline was mainly characterized by erosion from 1973 to 1984 and showed an overall expansion trend afterwards. The expansion amplitude of coastline exceeded the highest during 1984-1993, with NSM reaching 100.2m. In addition, the artificial coastline shown the most remarkable change (8.27%~57.45%) among the different coastline types, which is mainly distributed in Daya Bay Petrochemical Zone, northern Fanhe Bay reclamation and aquaculture Section, Huizhou Port, western Kaozhou Bay reclamation and aquaculture Section, and vicinity of Huangbu Town section. The main reasons of coastline change include development of coastal aquaculture, construction of ports, industrial areas and coastal tourist areas, and the expansion of construction land due to population growth and economic development. Some segments of coastline, such as the core area of Xunliao Bay, as well as the east and the west flank of Shuangyue Bay, remained stable during the whole period. We conclude that human impact was the mainly driving factor and natural factors have little influence in charge of the coastline change during past nearly 50 years. Compared with other coastal zones in mainland China, the rate of change in Huizhou is less remarkable. Judging by the EPR (2.51%) from 2013 to 2019, the change of coastline in Huizhou sustained stable, thus we estimate there is not significantly expand toward the sea in the future.