The calculation of heat transfer coefficient for platen heating surface in combuster of circuilating fluidized bed （CFB） boiler has great influence upon the design and operation of said CFB boiler. The measurement of heat transfer coefficient for platen heating surface in 75 t/h and 130t/h CFB boilers has been carried out. The results show that the heat transfer coefficient on the gasside of platen heating surface has direct relationship with its location

bed temperature

and solid porticles carried in the flue gas. The said coefficient increases along with less distance from the grid

and higher bed temperature

as well as with large quantity of solid particles carried in the flue gas. These results have reference value for design of CFB boilers.