The intelligent video analysis system provides digital security protection support for crowded places such as airport terminals. The system integrates data acquisition equipment and information processing terminals, and provides functions including accurate perception of passenger flow, intelligent behavior analysis, and full-process tracking of personnel. It can collect statistics on passenger flow, regional number of people, crowd density and other data, and can provide practical functions such as regional intrusion alarm, left item detection, abnormal behavior alarm, etc. It can find and lock key personnel through human characteristics screening to ensure airport security.