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In order to enhancing the measurement security and the reliability of the testing course, a circuit design project about how to control and select many Signal measure channels based on the Wave-band Switch and a kind of Built-in Test(BIT)method is put forward in the pape,by studying the characteristics of the wave-band switch,the controlling rules and the test requirements. There are also some application examples about which in the paper. The test results of the circuit were:(1) having realized signal assigning and having a higher self-check efficiency just by two wave-band switch, (2)making the testing operation simple and direct, (3)making the self-check operation simple just like to finish a testing operation and to enhance the operation visibility,(4) having realized the online self-check in some sense. It is validated that the circuit design project can greatly improve the testability and diagnosis capability of the system and has better of actual application value.