At least 850,000 people were evacuated from vulnerable areas of Fujian and Zhejiang provinces since Sunday, other state media said.
In Zhejiang's Wenzhou City, water was already filling the streets as winds of up to force 12 battered buildings, the radio report said.
There were no immediate reports of casualties.
The national meteorological office forecast that the typhoon would move northwest overnight.
Chinese authorities have been on high alert after learning lessons last year when Typhoon Rananim devastated the area, killing at least 164 people.
Frantic round-the-clock preparations that began on Monday have seen volunteers and 5,000 of the People's Armed Police mobilized to evacuate people to higher ground, reports said.
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