The fire broke out at Zuxintang Foot Massage Parlor in Tiantai County yesterday and it was extinguished in less than two hours, state-run CGtN said.
Eighteen people have been killed and 18 others injured, officials said.
Eight people were found dead in the fire, while another 10 died in hospital after medical efforts failed, they said.
Pictures on microblog Sina Weibo show a building engulfed by heavy smoke and people jumping out of windows, while firefighters were trying to tame the blaze.
The cause of the fire is not known yet, they said, adding an investigation into the accident is under way.
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