Riser has been and will be an important part of the offshore production system. Due to the complexity of environment, reliability evaluation is needed for the riser system to ensure the safety and durability. The analysis of the failure modes of riser system was studied in this article, firstly, the main factors of which may lead to failure of riser system were analyzed and classified; secondly, a time-variant reliability evaluation method was proposed to calculate fatigue reliability of riser system; finally, riser fatigue reliability of a certain FPSO is calculated by the proposed method, the results showed that time-variant reliability can better externalize safety of riser during structural service. The proposed method of this paper was significance in safety and integrity assessment of riser system.

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