Combining the traits and demands of cooling technology in hot strip mills or CSP, the operating characteristics of water pumps and pump units are analyzed. In this paper, the standpoint which conditions of mode that cooling-water motors are assisted by backwater hydraulic turbine with stable pressure can be adopted. This way has simple structure and is economical, but is affected by the motor form. So electricity generated by cooling water overflow hydraulic turbine with stable pressure is the best mode of energy recovery system.