Abstract: The network transactions based on trust have become increasingly important，but the trust evaluation model is not perfect in Web services，such as unknown identity of requestor，incomplete influence factors on trust degree and strong subjectivity.In view of the above questions，this paper proposes a trust enhanced comprehensive evaluation model for Web Services—WS-TECEM.On the basis of traditional model，WS-TECEM introduces the thought of trust relationship strength，first or second or third-hand view and the reliability of credit reference.The proposed model is much fine in trust granular and more powerful in trust index.The experimental result shows that the WS-TECEM can more fully and accurately measure the trust degree between service requestors and service providers.