Abstract: The differential protection technical transformation of 110 kV double busbar is a common subitem in the secondary system renovation project of substation. Five feasible construction schemes of 110 kV double busbar differential protection technology are presented in the paper. And taking the risks that exist under specific construction conditions of substation as an example, the advantages and disadvantages of each scheme are analyzed. Finally, the optimal solution suitable for construction conditions is selected by expert voting, and the key points for risk prevention and control under this scheme is proposed. The paper has certain reference value for risk analysis and control in the transformation scheme of 110 kV double busbar differential protection technology.