Selling pirated books is illegal. In China, pirated books were considered as an intellectual property violation and would be suspected of violating the "copyright law" and other relevant laws and regulations. According to the law, the creator, seller and user of a pirated book would be considered as an offender. If a pirated book violated the author's copyright, the creator and user could face a fine, detention, and other penalties. In addition, selling pirated books will also harm the interests of legitimate booksellers because they need to pay rent, advertising fees and other fees to buy legitimate books. The price of pirated books is low, and legitimate booksellers may lose market share. Therefore, selling pirated books is not only immoral but also illegal. We should resist the act of pirated books, support the legitimate ones, and respect intellectual property rights.