Abstract: Beginning from the actual starting process of circulating water system under the condition of empty pipes in the conventional thermal power plant, kinds of factors which influence the safety of circulating water system startup under condition of empty pipes have been analyzed, and, combining the practice, the operation method and suggestions were provided as a reference for formulating startup plane of the same type system.

Key words: circulating water system start-up under condition of empty pipes, the characteristic curve of water circulating pump, water hammer, start-up scheme