Abstract: With the rapid development of avionics system,the requirement of ensuring different security classification software not to communicate in the avionic operate system is more and more strict．In this case,multiple independent levels of security and safety (MILS) embedded system was proposed．The middleware in MILS is Real-time CORBA (RT CORBA)．And MILS CORBA is used partition communication to communicate with each other．In order to meet the security of partition communication and the strict control of the security classification in MILS,the multiple security partition communication in MILS architecture based on RT CORBA was proposed．The mechanism we proposed is that MILS IOP as a part of real-time CORBA can ensure to achieve multiple security partition communication in MILS CORBA．The whole mechanism can ensure that the transmissions among the data of different security classifications are independent．And it also guarantees the security of the whole system.

Key words: MILS,Real-time CORBA,Partition communication,Multiple security,Encryption and authentication