Abstract: In order to meet the safety requirement of nuclear power plants, the residual heat must be removed by the passive system under severe accidents. An experiment is conducted on the heat exchange characteristics of Secondary Passive Residual Heat Removal Condenser（SPRHR condenser） under different vapor pressure and temperature conditions. The results show that the heat exchange characteristics of SPRHR is stable and with enough safe margin. The heat exchange characteristics of SPRHR can be predicted well by Shah and Foster-Zuber correlations.