That followed a similar pattern on Friday, when 38 planes flew into the area south of the self-governing island.
China claims Taiwan, which lies off its east coast, as its territory.
The two split in 1949 during a civil war in which the Communists took control of mainland China and the rival Nationalists set up a government on Taiwan.
Mass incursions used to be rare.
But in the last two years Beijing has begun sending large sorties into Taiwan's ADIZ to signal dissatisfaction at key moments - and to keep Taipei's ageing fighter fleet regularly stressed.
Last week 24 Chinese warplanes flew into the area after Taiwan applied to join a major trans-Pacific trade pact.
Alexander Huang, associate professor at Tamkang University in Taipei, said he believed the latest aerial incursion was not just about sending a message to Taiwan.
"There's three other carrier attack groups in the region, two American and one British," he told AFP.
"China is sending a political message to the US and UK on her national day: Don't mess around in my area."
Canadian, French and Australian warships have all made voyages through the Taiwan Strait in recent years, sparking protests from China.
Additional reporting: AFP