Abstract: On June 16, 2019, a large-area blackout occurred in Argentine power grid. The accident caused blackouts across Argentina and Uruguay, and affected parts of Brazil, Paraguay and Chile, and about 48 million people were involved. The operation status of Argentine power grid before the accident and the cause, process and recovery of the blackout are introduced. It is pointed out that the immediate causes of the accident are the security control system strategy not updated in time, insufficient load cutting of under-frequency load shedding and the unqualified network-related performance of some generator units. Combined with the actual situation of power grid in China, some recommendations for ensuring the security and stability of power grid and preventing the occurrence of blackout are presented.