系统形态正从面向封闭的、熟识用户群体和相对静态的形式向开放的、公共可访问的和动态协作的服务模式转变。实体之间存在很大的陌生性，信任保障机制作用就显得举足轻重。本文从可信的角度对服务组合面临的挑战进行了综述，阐述了可信服务组合的基本概念、核心技术，比较全面地概括、分析了可信服务选取、组合服务运行保障机制、安全交互机制以及服务组合可信度评估等几个方面的研究内容，并对这些技术进行了总结和比较。此外，还指出了目前研究存在的不足以及未来的发展趋势。

Systems have moved away from the close, familiargroup and relativestatic pattern to the open, publicvisiting and dynamic coordinate pattern. Because of the unfamiliar feature between different entities, it is important to use a trustguarantee mechanism. In this paper, we clearly discuss the challenges for service composition from the trust point of view, including the basic concepts, the key techniques and the related work such as selecting trustworthy services, runtime guarantee mechanism, security, trust evaluation, etc. After that, a comparative study among some key techniques is presented. Finally, some open issues are discussed, and the future direction of trustworthy service composition is pointed out.