Signal path testing method

The invention belongs to a nuclear power station signal test technology, and particularly relates to a signal path test method. The method comprises the following steps: S1, splitting a signal path into a first signal path and a second signal path, splitting an A end into an A1 end of the first signal path and an A2 end of the second signal path, and splitting a B end into a B1 end of the first signal path and a B2 end of the second signal path; S2, connecting a signal source and a first test signal at the A1 end through OR logic, connecting the signal source and a second test signal at the A2end through OR logic, and connecting a test result signal with the B1 end and the B2 end through OR logic; S3, respectively starting the first test signal and the second test signal, and if two testsignals can be respectively detected at the test result signal position, determining that the signal path is normal; and if no test signal is detected or only one test signal can be detected at the test result signal position,