to cancel a trademark that has not been used for three years is to cancel a trademark that has not been used for three consecutive years, so as not to occupy resources. The industrial and commercial bureau usually does not take the initiative to investigate. However, if someone wants to register that trademark, they may request the Trademark Office to cancel the three-year non-use. Whether the revocation is approved or not depends on the situation. But the result is not absolute. If you don't want to be revoked, you will have to use proof materials, such as signed contracts, business cards, etc. within three consecutive years. The Trademark Office will review them as appropriate, and as long as there is sufficient evidence, they will not be revoked.