Taiwan says 20 Chinese military aircraft entered its air defense identification zone on Friday.
It is the largest number for a single day since September, when Taiwan's defense ministry began announcing data in the current format.
Ministry officials say the fleet included 12 fighter jets, four bombers and two patrol planes.
They say Chinese military aircraft normally head home after reaching waters southwest of Taiwan, but some went further this time, passing through the Bashi Channel between Taiwan and the Philippines.
Media in Taiwan say China's move was in response to an agreement signed by the United States and Taiwan to strengthen cooperation between their coast guards.