Abstract: The development of thin slab continous casting and rolling technologies throughout the world has been reviewed.The "CSP" technology employed by Nucor Steel of the U.S.and ISP adopted by Arvedi of Italy have been examined with an introduction to the equipments,plant layout and advantages of the production line of thin slab continous casting and rolling process. The technology of thin strip direct casting under development has been introduced in respect to the current trend of worldwide experimental study and the technical performance of the two roll thin slab caster widely adopted in most countries.Current state of the technologies in China has been briefly reviewed.