Customs administration used to mainly levy customs duty, collect taxes, enforce control measure entrusted by other competent agencies and counter smuggling. It appears that, with the development of globalization of trade, economics and politics, Customs administration also shoulders the responsibilities of maintaining social order, promoting economic development and even safeguarding the national security. It is obvious that Customs administration plays a more important role on performing duties from region, nation to internationalization.
Under the automated Customs system, cargo clearance is categorized into three types, namely C1 (free of paper and cargo examination), C2 (subject to document scrutiny) and C3 (subject to document scrutiny and cargo examination).