This Rules is formulated based on the safety risk and certification risk of vehicles and trailers products; it specified the basic principle and requirements for implementing China Compulsory Certification of all vehicles including its applicable scope; its purpose is to ensure that the certified vehicles meet laws, regulations and standard requirements continuously. This Rules can be used with other general rules issued by Certification and Accreditation Administration (CNCA), such as China Compulsory Certification implementation detailedrules - Manufacturing Enterprise Classification Management, Certification Mode Selection and Determination, China Compulsory Certification implementation detailed-rules - Utilization of Manufacturing Enterprise Testing Resource and Other Certification Results, China Compulsory Certification implementation detailed-rules - Factory Inspection General Requirements. Certification body shall formulate certification implementation detailed-rules and implement it along with general rules and this Rules, according to the requirements of the implementation rules and this Rules, and in combination with the manufacturing enterprise classification management. Manufacturing enterprise shall ensure that produced products with certificate can continuously meet applicable standard requirements.