By varying the anchoring condition, the helical structure with a long-range order is achieved as a thermodynamically stable state without external supports. Poly [6-(4-methoxy-azobenzene-4'-oxy) hexyl methacrylate] (PMMAZO) is deposited onto the silicon substrate to tune the anchoring. Both orientation and pitch can be controlled by varying the PMMAZO grafting density. As the grafting density increases, the enhanced titled deformation of helical structure suppresses the pitch size. As the cell thickness increases, the pattern transition from a long-range order stripe to a small fingerprint domain is facilitated.