On November 10, 2009, a widespread electrical blackout occurred in Brazil. The pre-fault situation, causes, spread and restoration of the blackout are described in this paper based on the official investigation report of Brazil Operador Nacional do Sistema Eletrico(ONS).The lessons and experiences of the blackout are analyzed and summarized. Some recommendations for guaranteeing the security and stability of China Power Grid and preventing the occurrence of blackout in China are presented.