浮式生产储卸油装置（FPSO）的系泊系统对其海上稳定定位至关重要。由于系泊系统在服役期间需持续承受数十年复杂海况作用，因此构件疲劳成为影响其安全性和可靠性的关键因素。旨在研究考虑季节性载荷特征的系泊系统疲劳寿命评估方法。首先，基于实测监测数据，开展了系泊系统疲劳寿命评估方法研究。通过对我国南海某特定海域长期风、浪、流数据的深入分析，发现该海域环境载荷呈现显著的季节性变化规律，这对于准确评估系泊系统构件的疲劳寿命至关重要。因此，在疲劳寿命评估模型中引入了季节性载荷特征，以更精确地模拟实际海况并评估疲劳寿命。以南海某FPSO为例，分析结果表明，系泊系统链1～链4的锚链疲劳寿命低于其他锚链组，表明考虑载荷季节性特征在系泊链疲劳评估中的重要性，可为后续工程运营维护提供重要的参考依据。

The mooring system of a floating production storage offloading (FPSO) unit is crucial for its stable positioning at sea. Given that the mooring system must endure complex marine conditions over decades of service， component fatigue becomes a critical factor affecting its safety and reliability. This paper aims to study the fatigue life assessment methods for mooring systems， taking into account the characteristics of seasonal loads. Initially， based on actual monitoring data， we conducted research on fatigue life assessment methods for mooring systems. Through an in-depth analysis of long-term wind， wave， and current data in a specific area of the South China Sea， we discovered that the environmental loads in this region exhibit significant seasonal variation patterns， which are vital for accurately assessing the fatigue life of mooring system components. Therefore， this paper incorporates seasonal load characteristics into the fatigue life assessment model to more accurately simulate actual sea conditions and evaluate fatigue life. Using an FPSO in the South China Sea as a case study， the analysis results indicate that the fatigue life of the mooring chains from Line 1 to Line 4 is significantly lower than that of other mooring chain groups. This finding underscores the importance of considering load seasonal characteristics in mooring chain fatigue assessments， providing essential reference points for future engineering operations and maintenance.