In recent years，there are still many kinds of MLM （multi-level marketing）criminal activities in China，especially the network MLM activities，with various new tricks and new means，use complex reward models or high return gimmicks to deceive the public and seek illegal interests. This paper focuses on cases that occurred in Beijing and other places，and closely combines the new features of the former network MLM activities，and analyzes the difficulties in combating them. Then according to the criminal law of China，this paper analyzes the essence of MLM criminal activities from the following aspects：whether to “sell goods，provide services in the name of business activities”，whether to charge an “entry fee”，whether to “defraud property”，etc.，in order to have a certain effect on the identification of such crimes.