hello everyone,
shown in the screen 
unit cell is not primitive.
my rndstr.in is :
3.8 3.8 3.8 90 90 90
0 0.5 0.5
0.5 0 0.5
0.5 0.5 0
0 0 0 Cu=0.5,Au=0.5
0.5 0.5 0 Cu=0.5,Au=0.5
how to solve the problem? thank you
The problem is more serious than just having a non-primitive cell.
Your 2 sites overlap: you have a lattice vector equal to 0.5 0.5 0 and an atom
at 0.5 0.5 0 in addition to 0 0 0 and (0,0,0)+(0.5,0.5,0)=(0.5,0.5,0).