Abstract: Abstract: The mobile edge database has redundant amount of information， and the additional key sequence is less flexible and adaptive， which leads to lower privacy information hiding degree and poor incremental encryption effect. For this reason， the incremental encryption method for mobile edge database privacy information is proposed. Based on the mobile edge database， clustering and encoding of private information， combined with the information coupling spatio-temporal evolution trend， in a chaotic mode， semantic transformation processing of private data， the introduction of priority key and mobile edge database proxy service， to determine the similarity of the keyword coordinate value， the generation of data keys. Combined with the priority encryption strategy to audit the encryption process， the incremental encryption of privacy information is completed. After Simulation testing， the information hiding degree is always controlled above 96%， and the change of ASCII code value is more stable， basically stable at about 9. The results show that the method can improve the information hiding degree and the encryption effect is better.

Key words: Key words: mobile edge database, privacy information, semantic transformation, information security