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The integrated modular system based on the Line Replaceable Module (LRM) as the basic unit has become the developing trend of the modern military electronic system. LRM is one of the key technologies in two-stage equipment’s maintenance support system, and its testability is the key for the implementation. It is necessary to conduct the testability verification experiment under the LRM in the trial production. The paper summaries updated research status of related technologies of testability verification experiment in LRM system,points out some negative effects on the testability verification experiment of LRM system due to its electrical and mechanical properties.Key technologies and further research in this field are proposed. 