Big data comes from man's desire to measure, record and analyze the world and its endless quest. With the rapid development and application of information technologies, especially sensors, communications computers and the Internet, more and more human resources access to information, the speed is greatly accelerated, the levels and extent of the more subtle, human networks and the Internet of things do people and things become sources of data. Thus, big data has become an important asset of the human society in the era of the network, and it marks the advent of the era.