As the time of storage and service increases,all performance indexes of fabric tank shows various degrees of de⁃crease under the influence of environmental factors. The life estimation of fabric tank is of instructive significance to define con⁃demning period reasonably and develop new tank body material. Based on accelerated life test,taking fabric tank models as experi⁃mental subjects and air tightness as failure criteria,failure data of samples under the aging temperature of 110 ℃ are obtained, which are checked by the method of Weibull distribution probability graph test and Van⁃Montfort test. The failure probability statis⁃tic model of fabric tank is achieved. The result shows that the failure probability of fabric tank is obedient to Weibull distribution, providing a theoretical foundation for the dependability life estimation of fabric tank.% 随着储存和使用年限的增长，受环境应力的影响，软体油罐各项性能指标均出现不同程度的下降。对软体油罐进行寿命评估对于合理确定油罐的报废周期，开展新型罐体材料研究具有一定的指导意义。以软体油罐模型为试验材料，以气密性测试为失效判别标准，通过加速寿命试验，得到样本在110℃老化温度下的失效数据，并通过威布尔概率图检验法和Van⁃Montfort检验法对失效数据进行检验，得到软体油罐失效概率服从威布尔分布的结论，为软体油罐可靠性寿命评估奠定了理论基础。
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