Abstract: Code obfuscation encryption protecting scheme is put forward,aiming to solve the security problems of Mobile agents(MA) migrating across heterogeneous network execution environments.Code obfuscation technology is applied to MA,and MA codes of executing task will be hided and protected.Firstly,mobile agent protection scheme based on intersecting loop obfuscation and varying data relationship is put forward in this paper.Secondly concrete methods of obfuscation protection scheme are introduced,and it is showed in experiment at last,7 java decoders have been resisted using this scheme,which showed more validity than single-level exit obfuscation and multi-level exit obfuscation.