Marbling of beef refers to the mixture of muscle and fat in beef to form beautiful patterns, bright colors, clear red and white, and the shape is like natural marbling, so it is called it. The formation of beef marbling is the deposition of fat in muscle fibers. The more fat is deposited, the richer the marbling is. The marble pattern of beef is measured in the cross section of the bovine chest rib12 ~13 (the longest back muscle), and in Japan it is measured in the cross section of the bovine chest rib (6 ~ 7).