Abstract. Big Data called new oil in the future is affecting people's life. It has attracted much attention from academy, industry and national government departments. But there are many security problems in the collection, storage, mining and displaying of Big Data and privacy protection in it is directly related to the interests of user. Firstly, this paper will introduce concept of Big Data and analyzes many information security problems in it. Then, it will discuss the key privacy protection technologies and recent advances in anonymous protection, data encryption, access control, cloud storage location privacy and legal regulations. Finally, this paper will summarize and discuss further study of Big Data privacy protection.