The startup failures of the diesel fire pump on the “Offshore Oil 111” FPSO were systematically studied, and the causes of these failures and potential improvement measures were analyzed. The research shows that by optimizing the temperature management of the control cabinet and performing regular maintenance， the frequency of startup failures has been successfully reduced to no more than once per quarter， significantly enhancing the reliability of the equipment and the safety of the FPSO. The discussion on the fire safety of offshore oil platforms provides a reference idea for related fields， and the proposed improvements offer insights for equipment management in other offshore operations.