The sources of big data include transaction data, manual data, machine and sensor data. Transaction data includes POS data, credit card data, etc. Artificial data, including mail, documents, pictures, data streams, etc. It is generated through WeChat, blogs, tweets, etc. ; As well as machine sensor data, such as sensors, meters and other facilities. Big data, or huge amount of data, refers to the information that is too large for mainstream software tools to retrieve, manage, process and sort in a reasonable time, so as to help enterprises make more active business decisions. Big data needs special technology to effectively handle a large amount of data that can tolerate the passage of time. Technologies suitable for big data include MPP database, data mining, distributed file system, distributed database, cloud computing platform, Internet and extensible storage system.