The present state and tendency of large capacity circulating fluidized bed(CFB)boiler technology was summarized and analysised,technical level of domestic and foreign CFB boiler was compared.300 MW CFB boiler has entered basic mature stage in china,recent target of research and developing is supercritical pressure CFB boiler.according to coal resource distribute situation of our country.technical idea was present that research and application of large capacity CFB boiler used low grade fuel with low heat va...