Introduction  Due to the technology blockade by foreign manufacturers， the research on the application of large capacity offshore flexible DC transmission technology in China is still in a blank stage. The paper presents a compact layout scheme for the large capacity offshore flexible DC converter station， which not only meets the requirements of process flow， but also minimizes the size of the platform.

  Method  According to the function orientation and working principle， the converter station could be divided into five areas： AC field， valve hall， bridge arm electric reactor area， DC field and auxiliary room. Through the study of the layout principle of each area， the recommended layout scheme was given.

  Result  The compact layout plan plays an important role in improving the reliability of the offshore converter station， alleviating construction and maintenance work and reducing the overall cost of the project.

  Conclusion  Flexible DC transmission is developing towards the direction of large capacity， high voltage and long-distance transmission， which is the best proposal for large capacity offshore wind power output. The compact layout scheme proposed in the paper can play a good role in guiding the large capacity offshore flexible DC converter station， and has a high reference value.