WeChat is a kind of multi function instant communication tool, that is a new social media based on the produce in the mobile Internet. WeChat is also a kind of tool for network marketing, the positive significance in communication aspects and social values have long been known for the people. But in the aspects of cultural influence on the behavior of the netizen, the negative influence can not be underestimated. This text will focus on the "micro era" network behavior culture inquiry from the form of communication, marketing and other aspects.