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Improving the portability and instrument interchangeability of test program are the key and difficult problems in the automatic test system design. A variety of specifications and standards have been promoted and has been used widely now. A large number of nonstandard instruments and boards have to be used in special testing equipment. Their drivers don’t follow standards and specifications, and the existing interchangeability technology cannot be directly used in software development. A implementation method according to special test equipment with requirements interface is proposed via abstracting test equipment functional requirement and neglecting the specific details of the instrument and board. The test program is in view of interface development and achieves the separation of test business and low level driver. The driving interface and component and encapsulation of non-standard instruments’ control could reduce the software influence from hardware change. Application shows that the method has excellent operability and can solve the problem of instrument interchangeability in specific fields.