回复：O1签证是否允许有移民倾向？

A few years ago, Yes. However, since 2005, every USCIS memo or Q&A related to dual intention or I-512 AP consistently omitting O and P visa. So, if you file I-129 now for O1, better mention (or hint) plan to return to China.

The confusion was due to that H-1 and L are the only two types mentioned in the INA as example of dual intention. So, in the late 1990s, H4 visa was commonly rejected by immigrant intent. In the early 2000s, INS treated any H/O/P as H1/L, since 2005, only H/L/K/V were consistently mentioned as allowing dual intents.