If your trademark is revoked by them, you need to provide evidence to prove that you have used it for about three years. The use of trademarks by trademark registrants and trademark licensees can be regarded as the use of trademarks. There are many evidences of trademark use, such as commodities, packaging, invoices and transaction vouchers, which support each other and form effective evidence. Let's not discuss the rationality of legislation. Existence is reasonable, which is also a way to urge trademark owners to use trademarks and avoid waste and idleness of trademark materials. However, in the process of application and review, I think there is still room for improvement. Obviously, the cost of revoking the third trademark has greatly increased. In practice, many trademark owners "accidentally hurt" by revoking the third trademark, and the reason for revoking the third trademark is often to avoid conflict with the trademark of the prior obligee, so as to avoid changing the name or paying high trademark license fees. Many applicants quit the third place with a try attitude, which is the first step to clear the obstacles of trademark rights. In any case, the cost of returning three products is not high, which is naturally good, and it doesn't matter if it doesn't work.