Big data has bring continues an rising in the word of data analytics. Big data contain very large data set and complex data structure. Traditional data model divided in the set of attributes like sensitive, quasi identifiers and non-sensitive attribute. Therefore, it is difficult in unstructured data to identified sensitive and quasi identifiers. Big data contain personal information that have privacy could be a main security anxiety. There are three privacy preservation methods: Anonymization, Differential privacy, Data and consent.