Based on the potential risks in the life cycle of the floating platform, the early warning parameters are selected and the early warning threshold is determined. Using a deep-water floating platform as an example, based on the detailed numerical analysis, the selection of the key parameters of early warning related to the overall performance of the platform and the algorithm and implementation of real-time determination of the early warning threshold are studied. Comparing to the traditional fixed threshold method, the real-time threshold method can minimize the occurrence of false alerts and missing alerts.