In view of the long-term risks of settlement,displacement,scouring,and collapse in breakwaters of hazardous chemical terminals,a comprehensive monitoring study on the basis of multi-source data integration is conducted,and a two-year engineering application is carried out on the breakwater of a liquefied natural gas project in Jiangsu.Twenty-five global navigation satellite system monitoring points are deployed for millimeter-level settlement and displacement monitoring.Underwater topographic data are acquired and processed by the fusion technology of multi-beam and side-scan sonar to generate high-precision 3D topographic maps.Surface sliding and collapse of the breakwater is identified by combining unmanned aerial vehicle imagery with high-definition camera surveillance.Finally,all monitoring data are integrated through a cloud platform to achieve real-time collection,monitoring,and comprehensive analysis.The results show that the integration and comprehensive analysis technique of multi-source data greatly enhances the accuracy and timeliness of breakwater monitoring,achieving a transition from single-point,low-frequency manual monitoring to multi-dimensional,automated,and intelligent monitoring.This technique provides reliable technical support for the safety management of hazardous chemical terminal breakwaters and offers valuable reference for the safe operation and risk management of similar port facilities.