Abstract: The article introduc the  present research situation of obfusation technology and the software obfusation technology,gives a further study on obfusation method based on the opaque predicate,and presents a Java-based program to construct opaque predicate.This program increases the complexity of opaque predicates,improves the dynamic analysing obility to resist attacker,and thus increases the difficulty in de-compilation.

Key words: de-compilation, code obfuscation, opaque predicates, indeterminate equation