How to apply for a visa when going to Mexico after you have a US visa?

Yes. Chinese citizens holding a tourist visa to the United States can travel to the United States and Mexico at the same time. Regardless of whether you are entering Mexico via the United States or not, even if you fly directly from China to Mexico without passing through a third country, you can enter Mexico as long as you hold a valid U.S. visa.

Note that the U.S. visa you hold when arriving in Mexico must be valid in order to enter without a visa.

If a Chinese citizen holds a visa valid for 6 months and can enter the United States multiple times, he can enter Mexico without a visa during the validity period of the visa.

For another example, a Chinese citizen went to Mexico with a U.S. visa valid for three months and valid for one entry. When he came to Mexico through the United States, his single-entry U.S. visa had already been used and was invalid. He had to apply for a Mexican visa in advance before he could be allowed to enter Mexico. If he comes to Mexico first and then to the United States, he can enter Mexico without a visa.

With a US visa, you can stay visa-free for 180 days when going to Mexico, 30 days when going to Panama, 180 days when going to Bermuda, and 30 days when transiting through South Korea.