就消防的領域而言，消防是一種綜合性的科學。凡舉火災的發生及火災探測，火災的延燒及滅火設備的設計與維護等，均是消防安全研究的重要課題，然而一些相關消防設計的評估?充滿了不確定性，因而也顯出機率與可靠度分析的重要性。本文主要係利用可靠度或危險率函數的理論基礎，來討論火警警報設備與滅火系統的可靠度或失效情形，文中除了介紹基本理論外，對串聯系統、並聯系統與多種設計係統也提出分析，此外亦有相關的範例討論，將平常只是概念的危險，提供一些具體的量化數據，可提供消防行政、防火管理、消防設計與設備維修保養方面的參考。

Fire science is a multi-dimensional one. Important research regarding fire science at least includes fire occurrence, fire spread, design and maintenance of fire detection and suppression systems. All of these involve uncertainty. Therefore, probabilistic nature and system reliability of fire safety design are important and should be carefully considered. This study introduces the basic theory of reliability, hazard rate function and the failure cases, discusses several system designs such as series systems, parallel systems, standby system, shard load system and complex systems and analyzes relevant examples. Not only Conceptual discussion but also quantitative analyses are investigated in this research. Findings, of this study could provide some useful comments for administrative unit, fire management, fire design and device maintenance sectors.