The joint inspection is commonly known as the three levels:

Customs, frontier (border) inspection station, entry-exit (immigration) inspection and quarantine (CIQ), etc.

1. Customs: Customs is a government agency in a country or region that controls the import and export of goods and related matters. It is responsible for reviewing cargo reports, collecting taxes and fees, and enforcing other regulations and procedures related to imports and exports.

2. Border (border) inspection stations: Border (border) inspection stations are established by law enforcement agencies at national or regional land borders to monitor the flow of people and ensure safety. These agencies will conduct identity verification, passport/visa verification and other procedures for people crossing the border, and strictly review items carried to ensure compliance.

3. Entry-exit (Immigration) Inspection and Quarantine (CIQ): Entry-exit (Immigration) Inspection and Quarantine is CIQ (Customs, Immigration and Quarantine). Its main responsibilities cover ocean transportation business management, air transportation business management and ports. Working with docks etc. Its goals are to maintain public health and safety, prevent the spread of diseases, and protect the country's agricultural, forestry and fishery resources.