Domestic ports are becoming increasingly complex due to the introduction of various marine 4th industry new technologies and the increase in marine logistics. Accordingly, the number of lightings behind the port is also increasing significantly, and there is a great demand for improving the visibility of the AtoN used as a means of transmitting information to vessel operators. This paper describes the development of the performance inspection system that can verify the synchronization and sequential flashing of maritime lanterns that is being introduced to enhance the visibility of AtoN.