本文以低周疲劳破坏作为软钢耗能器的破坏模式，建立了弹塑性滞回变形幅值和滞回循环次数的概率分析方法。在此基础上，按照线性累积损伤准则，提出了大震作用下软钢耗能器可靠度的分析方法。最后，通过算例分析证明了上述方法的可行性。 In this paper, the low-cycle fatigue damage is taken as the failure mode of soft steel energy dissipater, and the probability analysis method of elastic-plastic hysteresis deformation amplitude and hysteresis cycle number is established. On this basis, according to the criterion of linear cumulative damage, a method of analyzing the reliability of the mild steel dissipater under large earthquake is proposed. Finally, the feasibility of the above method is proved by the example analysis.