This study is designed by McLuhan's media law of tetrad.The author conducts a field observation in ManLa village，Yunnan province，China and attempts to explore the media development situations in rural area of China.The finding corresponds with the“Four Laws of Media”put up with by McLuhan，which indicate that the communication channels have developed from public gatherings to literature，broadcast，television and internet.Among this process of media involvement，some aspects of the media will been enhanced，retrieved，obsoleted or reversed，and finally bring ManLa village into a global village.This study also finds that new media，especially the smartphone，has generated significant effects on ManLa villagers that their behaviors，emotions as well as information seeking have been mobilized by this new technology.The smartphone and the mobile based social media-Wechat have become the online public space for the villagers，which can enhances，retrieves，reverses and obsoletes some aspects of those villagers' living styles，and allow ManLa people to connect into this digital information world.From this study，it can be seen that the traditional media will not disappear but will coexist with the newer ones.The media tetrad is an endless circulation and will influence the users in the form of generation coexisting.