1. Introduction

Reliability engineering is a series of technical and management activities carried out to meet the reliability requirements of the product. Reliability engineering through the study of the occurrence, development, and prevention of product failure, through design, analysis, testing, and other means, to prevent and control the occurrence and development of failure, and improve the inherent reliability of products, to ensure the success of product missions and reduce life cycle costs. Reliability engineering is an important part of the whole system and life cycle management of spacecraft. It includes the determination of reliability requirements, reliability design and analysis, reliability tests, reliability management, and other aspects. It runs through the feasibility demonstration phase, preliminary definition phase, qualification and production phase, and on-orbit operation phase of the project, and is applied to spacecraft systems, subsystems, equipment, components and parts, as well as electronic, electromechanical, optoelectronic, mechanical, structural, software and other types of products.