Is it easy to get a visa to be a postdoctoral companion in the United States?

China (public schools) or the United States? Postdoctoral students earn more than 30 thousand dollars a year, and their lives are very good. I suggest your husband go first. If your husband is a J 1 visa, you can apply for J2; If he is an H 1 visa, you are H4. Don't worry, this visa is still very easy.

Go again in a few years, or stay?

If you go back in a few years and get a J visa, you can also work legally. If you want to stay, it is recommended to apply for an H visa (depending on whether the school or research unit is willing), otherwise it will be very troublesome to transfer to an H visa in the future. But you can't work in H4 unless you also apply for H 1. J visa is a non-immigrant visa and must return to China after several years. H visa allows immigration.