航天发射场的加注系统是提供燃料的重要设备，需要进行可靠性分析和评定，分析影响系统可靠性的因素，确定其可靠度。

Fuel supply system of launch site is a very important system, and its reliability analysis and evaluation is required for analyzing the influence factors and evaluating its reliability.

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可靠性优化问题的基本难点在于系统每优化一次，参数、变量就要重新赋值，就要重新计算系统可靠度。

Basal difficulty on the optimize question of reliability is that when the system optimize the parameter, variable, must evaluate and must calculate the reliability once more.

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本文提出了一种新的钢轨疲劳寿命的可靠度估算方法，使可靠性分析第一次进入钢轨的寿命估算。

This paper proposes a new estimating method which, for the first time. introduces reliability analysis into the life estimation of railway rails.

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