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With the fast development of the testability demands of electronic products based on radars, the design iteration and testability Validation have already become one of the most fundamental requirements for electronic products. Because the initial design is defective and the failure modes are not covered completely, the test design cannot meet the requirements. Some design measures have been adopted,such as closed loop test, pulse detection, isolation strategy optimization etc. Lastly, a proper scheme is raised by taking the costs of software and hardware into account. The famous fault detection rate and fault isolation rate are obtained through the secondly testability Validation Test. The results show that the optimizations promote the design of the product testability and the improvement measures are effective.