Legal analysis: The trademark opposition period begins when the Trademark Office announces the preliminary approval of the trademark applied for registration. The trademark opposition period is three months from the date of announcement.

Legal basis: "Trademark Law of the People's Republic of China" Article 28 For a trademark applied for registration, the Trademark Office shall examine it within nine months from the date of receipt of the trademark registration application document. If it is completed and meets the relevant provisions of this Law, a preliminary review and announcement will be made.