Thermal expansion and magnetic susceptibility were measured for the compounds CrAs 1 - x S x (x=<0.20). The large spontaneous magnetostriction of CrAs, which occurs mainly along the B-axis of the orthorhombic MnP-type structure, decreases monotonously with the composition x and seems to disappear at x = 0.35. The susceptibility measurements for CrAs 0 . 8 4 S 0 . 1 6 show the crystallographic phase transition accompanied by a magnetic phase change at about 800 K.