In the age of big data, the increasing amount of data that can be collected and the different channels from which the data comes from can make it accurate and make anonymization ineffective. Big data brings convenience to life, but the threats it brings are also potential. The core idea of big data is to change the status quo with a dramatic increase in scale, which is the intent of multi-source data, but the more it is revealed, the more the world's privacy is revealed to the world.