Traditional reliability theory and method are still far from perfect since the embodiment and characterization on the reliability controlling factors such as load, strength,structural feature, and time as well are incomplete.Based on appropriate expression to the time-dependent property (i.e. load history effect and strength degradation effect),load uncertainty in both macro- and micro- aspects, the dependence between component failures in a system or the dependence between multi-susceptible locations on a structure,this paper presented the characterization method for complex load history,

reliability modeling method for different systems,highlighted the effect of load uncertainty

on system reliability-component reliabilities relationship,discussed time-dependent reliability property and the controlling factors.Finally,through system-level probability analysis/modeling methodology and multiple-level statistics theory,the paper developed uniformal reliability model for both component and system,built uniformal reliability model for both static failure and fatigue.

reliability, statistical characteristics of load, failure dependence, four-parameter model, fatigue

传统可靠性理论及方法没有综合考虑和精确表达载荷、强度、结构形式、时间等控制因素及其效应。在充分反映可靠性的时间属性（载荷历程效应与强度退化效应）、载荷的宏观与微观不确定性效应、系统中零部件之间或结构上各薄弱部位之间失效相关性的前提下，研究了载荷统计特征的表达、系统可靠性建模方法、系统可靠度-零部件可靠度关系的影响因素，揭示了载荷不确定性对系统可靠性-零部件可靠性关系的影响，讨论了可靠性时间效应原理，应用系统层概率分析与建模思想和多层统计分析等现代数学方法，建立了零部件可靠性模型和系统可靠性模型，实现了系统可靠性与零部件可靠性模型形式的统一、静强度可靠性与疲劳可靠性模型形式的统一。

可靠性, 载荷统计特性, 失效相关性, 四元模型, 疲劳