Abstract:At present,the cold ironing could be regarded as one of the key technologies in the construction of low carbon environmental friendly green port. Many ports during domestic have carried out application demonstration in this field. In this paper,the main electrical connection mode in the high voltage cold ironing system will be discussed; the advantages and disadvantages of these connection modes are also analyzed and compared in this paper. The research result could provide technical references with the cold ironing system rational distribution in the port.