Abstract: In order to find the reason of fault of the sintering fan, the characteristics of fix pad journal bearing and the stability of rotor-bearing system of sintering fan were analyzed. Using the device of CAMD-6100 rotor mechanical fault diagnosis, the reason of sintering fault diagnosis of sintering fan vibration was presented. The vibration signals from running fans were measured and analyzed. And it is found that the fault reason of running fans is unbalancing of rotors caused the vibration of fan.