To address the urgent need for TPS portability of airborne electronic equipment test systems and the current problem of non-specific UUT information description, refer to the ATML standard, UUT model description method based on airborne equipment was studied and modeling software was developed to implement standardized description of UUT. The UUT model description structure of the airborne equipment under test was presented, including the basic information and test information of the UUT, and the signal requirements of the UUT were described using a unified signal and test definition standard STD. When the tested device or test requirements change, a new UUT model xml file can be generated by the modeling software for use by the test program, which avoids the redevelopment of the test program and helps realize the portability of the TPS.