I want to put the emitter on the rolling wheel, what should I do to attach the emitter to it?

There is no rivet in sop …

I don't know the exact use case you're talking about, (a HIP file would help clarify), but if you use a Ray SOP with Method set to Minimum Distance and Prim Num Attribute and Prim UVW Attribute enabled, you can project something onto the rest geometry once, then use the Attribute Interpolate SOP (with the attribute names set appropriately) to move the points to the corresponding positions on animated geometry on every frame (or subframe). Hopefully that's something similar to what you're looking for.