With the development of the mobile Internet, smart mobile terminal and cloud computing, human society is entering the era of "Big Data". Based on the origin of big data, this paper explains the connotation and denotation of the concept and discusses its formation process. Then this paper explains the big data market condition　and business cases, and gives an analysis of existing research breakthroughs and deficiencies. Focusing on the influence that big data brings to industrial technology, electronic commerce, media development, political campaigns, information and security, this paper makes a detailed examination and puts forward policy suggestions. <<