Introduction  In order to analyze the reasonbility of the fan configuration of a 350 MW supercritical heating unit.

  Method  In this paper, the single-row configuration and double-row fan configuration was compared, it took the reliability of fans, the requirements of engineering heating and minimum annual fee method into congsideration.

  Result  The results demonstrate that the unstopped reliability rate of single-row fan configuration is slightly lower than double-row fan configuration. However, under the condition of high load operation, the heating supply reliability of single-row fan is higher.Single-row fan configuration econmic advantage is obvious.Therefore, it is more reasonable to adopt single-row fan for heating units which operats under high load operation for a long time.

  Conclusion  The conclusion of this study is not only applicable to this project, but also can provide guidance for other heating unit.