Aiming at the characters of Internet word-of-mouth compared with traditional word-of-mouth, this research proposes the hypotheses about the impact of Internet word-of-mouth on Consumer’s product attitude,. The author tests the hypotheses by conducting an experiment in the context of virtual community about movies. The result indicates that argument quality of Internet word-of-mouth and community credibility has positive effect on consumer’s product attitude. And involvement has interaction effect with argument quality of Internet word-of-mouth and community credibility respectively.