Exploring the perceived usefulness of online reviews is of great significance to the implementation of precision marketing of goods and the promotion of user participation to promote purchase decisions. Based on signal theory and confirmation bias theory, this paper explore differences in consumers’ perceptions of the usefulness of online reviews after understanding the detailed seller ratings through simulation experiments on 180 participants. The experimental results show that there is no significant difference between consumers' perceived usefulness of positive and negative reviews in the context of high and medium detailed seller rating; In the context of low detailed seller rating, the perceived usefulness of negative reviews is significantly higher than that of positive reviews.