Proposed is a data security maintenance method for data analysis application, including a data selection step of selecting data to be analyzed from a linked database management system (DBMS), a data request step of requesting the data to be analyzed, a data transformation step of transforming the data to be analyzed using a predetermined transformation method, a data analysis step of analyzing the transformed data to be analyzed, an error comparison step of comparing analysis errors for each transformation method, a tradeoff step of determining the extent of analysis accuracy and the extent of data security, and a data provision step of providing the result of analysis of the data to be analyzed.