Internet communication is the behavior and process that interchanges or communicates the information with the help of computer network. It incorporates various advantages of communication means and is a new method with more individualization and equality. Currently, internet became not only a convenient channel by which people can get information and understand the society, but also an important public platform for people public opinion, public affairs discussing, and economic social and political life participating, as well as for supervision.Internet opinion refers to the general public discourse and public discuss formed in a free expressing context through the face to face communication and mass communication. It has a lot of features, that is, constructing agenda effectively and immediately, expressing ideas frankly and acuity, with some degree irrationality. Internet opinion plays the role "two edges sword" in the development of democratic society, it has the function of accelerating or reducing the tension of the society.Employed the means of theory reviewed and testified and case studying, This paper researches the diversify dimensions, complicated functions of Chinese internet opinion in terms of the forming background, definition, features, function, limitation (majority tyranny) of internet opinion, by which we attempt to study briefly the important role of Chinese internet opinion in the constructing of the harmony society.