Classification Society is a non-governmental organization established to develop and maintain standards for the construction of ships and offshore facilities. Its primary role involves conducting periodic inspections during and after the construction of vessels, with the aim of setting standards for shipbuilding and their equipment. Classification Society plays a vital role in the maritime and offshore engineering industries and exist in most major maritime nations. Their core functions can be summarized as follows.

Classification Society formulates technical rules for the shipbuilding industry, which must be followed by shipyards, shipowners, and supporting enterprises; otherwise, vessels cannot obtain certification. They set standards for ship design and construction, specifying key technical requirements such as hull structure, material strength, and welding processes. Additionally, they develop testing and certification standards for marine equipment like engines, firefighting systems, and navigation devices, providing the technical basis for safe vessel operation.

Classification Society conducts lifecycle inspections of ships and their equipment. Vessels without classification certification cannot obtain insurance or financing and may even be denied entry to international ports. During shipbuilding, class surveys are required, where the society reviews newbuild designs and oversees construction. They also perform periodic inspections on operational vessels, including annual surveys, special surveys, and dry-docking surveys, to ensure continuous compliance with standards. Marine equipment must obtain Type Approval or Factory Approval from the classification society before being procured by shipyards.

Authorized by flag states (e.g., Panama, Liberia),Classification Society conducts statutory surveys. Ships must pass these inspections to obtain a Seaworthiness Certificate—failure may result in detention or fines. These surveys cover lifesaving appliances, firefighting systems, and navigation equipment.Fuel systems and sewage treatment, ensuring compliance with MARPOL (pollution prevention standards).Crew living conditions, verifying alignment with MLC (Maritime Labour Convention) requirements

Classification Society is not only regulator but also promoter of technological progress in the industry. They assist shipowners and marine equipment enterprises in adapting to regulatory changes and seizing market opportunities. They evaluate and certify new technologies, such as conducting safety assessments for innovative technologies including smart ships and unmanned vessels. By analyzing causes of previous ship accidents, they update industry operational standards to reduce similar risks. Pursuing low-carbon and digital economic development models, they establish carbon emission rating standards (such as EEXI and CII) and cybersecurity (Cyber Resilience) standards.

Classification Society possesses global ship technical data, enabling enterprises to optimize product design and enhance market competitiveness through this data. They conduct data-based and visual analysis of factors affecting ship valuation, insurance costs, and transaction prices, and compile this data into classification databases. Meanwhile, they provide technical guidance and regulatory interpretation for shipowners, shipyards, and supporting enterprises, promoting technical skill advancement for personnel in the shipbuilding industry.