This study follows the theoretical les of Deutsch and Gerrard¡¦s dual-process theory to determine the informational and normative factors that influence credibility judgments of on-line consumer recommendation by readers. In addition, this study also discusses how impulse traits and disposition of Trust play as a moderator on the influence of Electronic Word-of-Mouth on sender¡¦s WOM on the receiver¡¦s purchase decision. This study¡¦s main purpose as follows: ¤@¡B How world informational and normative determinants affect a user¡¦s credibility evaluation of on- line consumer recommendations? ¤G¡B How would this perceived credibility of eWOM influence its sender¡¦s WOM on the receiver¡¦s purchase decision? ¤T¡B Receiver of consumer recommendations¡¦ impulse traits and disposition of trust whether influence the relationship between perceived credibility of eWOM and sender¡¦s WOM on the receiver¡¦s purchase decision. This study has some finding as following: ¤@¡B Informational determinant-argument strength, confirmation with receiver¡¦s prior belief, expertise - significantly influenced perceived eWOM credibility. ¤G¡B normative determinant- - significantly influenced perceived eWOM credibility ¤T¡B perceived eWOM credibility significantly influenced sender¡¦s WOM on the receiver¡¦s purchase decision. ¥|¡B impulse traits and disposition of Trust could strengthen the relationship between perceived credibility of eWOM and sender¡¦s WOM on the receiver¡¦s purchase decision.