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In order to solve the problem of inconsistency between the number of channels of vibration exciter used in modal test system and the number of channels of excitation measurement module in modal test system, such as when people connecting and replacing channels between exciter and excitation measurement module, often need more time and got wrong connection, a signal channels controller is designed and implemented, which can achieve the arbitrary connection and online switching of channels up to 32 channels. The signal channels can be configured connected or unconnected. The unconnected channels are in high-impedance state. The tester only needs to connect the measuring channel to the output end and the measurement module channels of the modal test system to the input end. And then the tester can configured the channels through the LCD screen to realize the arbitrary connection of the input and output channels and online switching.