In this research, we have analyzed the researches and productions of solar collectors in Korea and U.S.A. In the U.S., collectors are produced by hundreds of manufacturers. The amounts are 23 million sq.ft for the liquid system, 358 thousand sq.ft of the air system and 266 thousand sq.ft for the vacuum tube and focus collectors. In Korea, a very small quantity is produced by several manufacturers. So they have to be largely dependent upon the imports in Korea. In the U.S., research topics include the materials development, design and applications. In Korea, however materials research has been rare and there have been only a few papers on selective coating. Researches have been limited to the system design and collector testing.