The defence ministry said it detected the firing by China's Rocket Force and army in the provinces and regions of Inner Mongolia, Gansu, Qinghai and Xinjiang from 6:50 am (2250 GMT on Saturday).
"The military has continuously monitored relevant developments, and the air defence forces maintain a high degree of vigilance and strengthen their alert," it said in a statement.
"The security and prosperity of the Indo-Pacific region are related to global development. Any threatening and provocative actions will seriously undermine regional stability," it added.
Beijing claims democratic Taiwan as part of its territory and has ramped up military and political pressure on the island in recent years.
Sunday's firings came after China said it test-launched an intercontinental ballistic missile on Wednesday, firing it into the Pacific Ocean in its first such exercise in decades.
The launch sparked protests from countries in the region, with Taiwan strongly condemning the action and urging Beijing to "exercise restraint and cease its reckless military drills which inflame regional tension".
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