How to display UV structures on this surface

i need the uv structure on this surface ,this is my surface and grasshopper ,why i can’t dispaly the uv on this surface,please help me!!!



That’s because your surface is trimmed. You can only get UV isocurves / subdomains for untrimmmed surfaces.
You could split the surface bu the isotrims borders. Or the other way around.

thank you !! teddy!! I figure it out !!