Pinduoduo's black five categories are: products related to weight loss, aphrodisiac, height increase, breast enhancement and medical devices. The reason why it is called "Black 5" is that merchants guide Pinduoduo, who has relevant needs, through soft articles, and then exaggerate the product effect or your own physical condition to convert orders. These violent online earning projects called "Black Five" have made many businesses earn the first 1 bucket of gold in their lives. Because of its low threshold, high profit and violence, it is called "Black 5" in Pinduoduo.