Thanks for your kind reply, Alex.
I believe your answer would help a lot of people who finds this Q&A.
However, what I really want is get all actors without knowing there types. And I just found that Get all level actors node is exactly what I needed. Combine with a save game, I got all actor names with thier paths.
What’s next is how to iterate each actor’s functions. I will update this Q&A once I know how to do that.
And once again, thanks for your great answer.