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In view of the difficulties in fault detection and isolation of helicopter airborne electronic system during the process of performing tasks, the low efficiency of maintenance support?in far-field, and the lacking of effective fault-detection tools, an in-situ testing system for airborne electronic system is designed based on ATML. The basic composition, working principle, hardware structure, software architecture and cable switching design method are described. Taking an airborne power distribution system as a case study to design the in-situ testing requirements analysis and test plan. After that, the the development method of test programs based on the testing software platform SGTS which using the ATML standard is developed. Furthermore, this method is applied to the development of an in-situ testing system for a certain type of helicopter. After practical verification, the using of this in-situ testing system has significantly improved the fault detection and isolation indicators of airborne electronic systems, and providing an effective and convenient means for helicopter field troubleshooting, on which improves the efficiency of field-maintenance.