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For testability design of modern airplane systems, program should be detailed further based on top level testability design. According to the aircraft system, detailed testability design includes three levels, which are airplane level, system level and equipment level. For the airplane level, integrated diagnosis, fault message display and report are described. For system level, a typical universal technique, i.e., module test and maintenance bus(MTM-Bus) based boundary scan is proposed. Bus configuration and hierarchy test structure are given. For product level, BIT design guide line and detailed content are set forth. This paper is proposed based on the requirement and engineering practice of airplane being developed, which may be helpful for airplane testability design.