Aimed at the configuration of condensers in the nuclear power plant in the coastal area in China, in this paper the thermodynamic characteristics between single and double backpressure condensers are compared to make an analysisof their technical and economic characteristics. The results show that double backpressure condenser has better thermodynamic characteristics while lacks application experience. Single backpressure condenser is better to be used in the coastal nuclear power plant with low temperature cooling water. However, when the temperature of cooling water is higher than 21 ℃, single and double backpressure condensers should be choosed according to the results of their technical and economic analysis. In the technical and economic analysis process, the risk of using dual pressure condensers should be considered.