Five homemade bombs and knives were seized in a series of coordinated raids, the police department in Wenzhou said on its microblog.
The statement did not identify the men's group, their nationality or ethnicity.
Chinese security forces have been conducting a nationwide campaign mainly against East Turkistan Islamic Movement (ETIM), a separatist militant outfit active among Uygur Muslims in Xinjiang province, nearly 3,000 kilometres from the major industrial city Wenzhou.
