Is that correctly the valid ranges of W and L of nfet_01v8 ?, how it's 130nm and can't use Lmin smaller than 7u ? the same small range for other transistors, or I'm missing some thing here ? @Tim Edwards

You are looking at a single bin of a multi-binned model.

ok sir how i get the whole range of that ?

@Belal Ali the line you showed is one of the 180 L/W ranges that are allowed, try

grep lmin sky130_fd_pr__nfet_01v8__tt.pm3.spice