Abstract: It is common for ccommerce Web sites to enable their customers to write reviews of products that they have purchased. Unfortunately, reviewers may write some untruthful opinions in order to promote or damage specific products' reputation which called review spam. Product review spam detection makes an attempt to find untruthful opinions and remove them to restore the truthful for readers. The difference between product review spam and other spams was analyzed firstly. The related work of review spam detection was presented including review helpfulness and review sentiment analysis later; and then the data set and methods to detect spam were introduced and summarized. The trend of product review spam detection was concluded finally.

Key words: Product review, Review spam, Product review spam