A four-way grid, comprising a plurality of nodes and a plurality of ribs, wherein the nodes and the ribs are connected to form a plurality of rectangular units. Each of the rectangular units comprises four first nodes (11, 12, 13, 14) which are located at four vertexes of a rectangle, and a second node (21) which is located at the point of intersection of diagonal lines of the rectangle, and also comprises first ribs (41, 42, 43, 44) which are located in the directions of the sides of the rectangle and are connected to every two adjacent first nodes of the first nodes (11, 12, 13, 14), third nodes (31, 32, 33, 34) which are located at the midpoints of all of the sides of the rectangle, second ribs (51, 52) which are located on the diagonal lines of the rectangle, and third ribs (61, 62) which pass through the second nodes (21) and are connected to each of the third nodes (31, 32, 33, 34), wherein the thickness of each of the nodes is greater than that of each of the ribs.