A blogger asked if, while in the U.S. on a B-1/B-2 visa, he could leave the country to visit Canada and then come back with the same visa.  Generally, Chinese citizens are issued 1-year, multiple entry visas.  So during this period, you can enter and exit the United States as frequently as you like.  If your visa says Entries “M” then you have a multiple entry visa.  If your visa class is B-1/B-2, then you can enter the U.S. as a temporary visitor for both Business and Tourism purposes while the visa is still valid.

In some certain cases, especially work visas, the visa class only permits two entries, so it’s important to check what your visa says before you leave the country.  But by and large, multiple entries are permitted.

-Vice Consul