Based on the idea of trust evaluation, this paper proposes an Internetware software architecture oriented trust-driven mechanism for selecting services to solve the problem from the aspect of service selection: Firstly, a general, machine-readable description mechanism is proposed to express user requirements and trust evolution policies; secondly, a feed-back trust formation and decision mechanism is introduced and a trust-driven algorithm for selecting services is given; finally, an Internetware software architecture oriented trust-driven service selection framework is proposed for the development of trustable Internetwares. Some development examples indicate that this mechanism can support the development of the trustable Internetwares effectively.