Epistemic vigilance contributes to the stability of communication, hence an integral part of interpersonal trust. Inspired by the factors of trustworthiness evaluation in trust model, this paper accordingly proposes three cues for hearer’s epistemic vigilance, namely, feasibility, consistency and motivationality. In light of the epistemic vigilance mechanism, this study aims to reveal the interaction between trustworthiness evaluation and its wash back on the conversation participants. It is found that epistemic vigilance exerts constraints on our communicative behaviors: The hearers check the reliability of the source and content of the information, while the communicators mobilize linguistic resources to manipulate the hearers evaluation via evading epistemic vigilance. This dynamic two way trust model, by way of highlighting the checking effects of epistemic vigilance on trust construction, will shed light on the relation study in interpersonal pragmatics.