The present disclosure discloses a method, system, and computer program product for extracting business rules of a Service-Oriented Architecture (SOA) system. Each of the method, system, and computer program product providing functions comprising: obtaining values of a plurality of business objects; obtaining structure units of the SOA system; establishing association relationships between the structure units and the values of the business objects; and generating business rules based on the association relationships. Using one or more embodiments of the present disclosure can break through the limitations of the conventional method of extracting business rules of a SOA system based on code, and can extract business rules of a complex SOA system.