Taiwan defence ministry’s warning comes a week after China mounted four consecutive days of record air force incursions into the Taiwanese air defence zone.
Taiwan says it will not start a war with China but will defend itself "full on", amid a spike in tensions across the Taiwan Strait that has raised international concern.
"What is clearest is that the Republic of China absolutely will not start or set off a war, but if there are movements we will meet the enemy full on," Defence Minister Chiu Kuo-cheng told a parliament committee meeting, using Taiwan's official name.
Military tensions with China, which claims Taiwan as its own territory, are at their worst in more than 40 years, Chiu said last week, adding that China will be capable of mounting a "full-scale" invasion by 2025.
He was speaking after China mounted four consecutive days of mass air force incursions into Taiwan's air defence identification zone that began on October 1, part of a pattern of what Taipei views as stepped-up military harassment by Beijing.
No shots have been fired and China's aircraft have stayed well away from Taiwan's airspace, concentrating their activity in the southwestern corner of Taiwan's air defence zone.
The ministry, in a report to parliament ahead of Chiu's appearance before lawmakers, warned China of strong countermeasures if its forces got too close to the island.
Chiu agreed with an assessment from a lawmaker that China's abilities were constrained by a limited mid-air refuelling capacity, meaning it has only H-6 bombers and Y-8 anti-submarine and reconnaissance aircraft that have flown into the Bashi Channel that separates Taiwan from the Philippines.
Chinese fighters have kept much closer to China's coast, according to maps of their activity drawn up by Chiu's ministry.
"Their aims are on the one hand to pressure Taiwan, and on the other to say to everyone else we have the ability to scare away and obstruct foreign military forces from getting involved," he said.
Taiwan, a major semiconductor producer, has repeatedly said it will defend itself if attacked, but that it will not "advance rashly" and wants to maintain the status quo with China.
China on Wednesday called its military activities a "just" move to protect peace and stability, and again blamed Taiwan's "collusion" with foreign forces - a veiled reference to the United States - for sowing the tension.
China's Washington embassy said it had complained to the US government about a meeting between Taiwan's de facto ambassador to the country and senior US diplomats, and of the visit of Taiwan's army commander, Hsu Yen-pu, to the United States.
"The US should not fantasise (about) seeking China's support and cooperation while wantonly challenging China's red line on the Taiwan question," it said.
Speaking earlier in the week, Chiu said Hsu was not in the United States on a secret trip but as part of regular annual exchanges, according to Taiwan's official Central News Agency.