How to construct this kind of background wall in the picture ah

Should be dry hanging process. Inside is a steel skeleton, and then use dry hanging parts to fix the stone in the steel skeleton.

With the rear steel plate and then fixed vertical 8 # channel steel (usually spacing is not greater than 1 meter), and then outside the channel steel is horizontal angle (generally 50 * 50 * 5, the minimum is not less than 40 * 40 * 4), the angle spacing with the height of the stone plate, and then the dry hanging of the stone is fixed in the angle.