Based on the analysis to ARINC763 Standard and ARINC834 Standard,and considering the flexibility and expansibility requirements to safe connectivity of current civil airborne network,we designed an Avionics Interface Application(AIA)software for the airborne network service system.The key points of the design include:1) the definition of Avionics Interface Data Communication Protocol,which integrates and expands the protocol models defined in ARINC834 by adding application registration and monitoring capability;and 2) the combination of application access control and data authentication,which refines the architecture defined in ARINC763 and reduces the system complexity.The software has already been applied in a civil aircraft development project,which can realize secure data communication between core avionic network and network service system.