Abstract: On January 9, 2021, the failure of Pakistan's Gudu Power Plant caused a cascading failure of its national power system, triggering the largest power outage in Pakistan since the founding of the country. The accident caused great darkness in all the major cities in Pakistan, including Islamabad, the capital city, Karachi, the economic center, and Lahore, the second largest city. The article introduces the general situation of Pakistan's power grid, describes the operation status of the power grid before the accident, and illustrates the development process and the recovery of the accident. The main reasons for the accident are preliminarily analyzed from the grid structure, the protection mechanism, the management process, etc. A comparative analysis of the three major blackouts in Pakistan is given. Combined with the reality of my country's power system, the enlightenment of the Pakistan blackouts to China's power system is proposed.