Points are represented by ternary ordered real arrays in the spatial rectangular coordinate system, and the order of the three is fixed, according to the order of (xyz); The points in the space correspond to the ternary real array of their constituent coordinates one by one; In space, three coordinate planes divide the space into eight parts, namely eight hexagrams. For a point in space, the ternary ordered real array is different in different coordinate systems, so the position is different.