The absorption and utilization of calcium by human body are influenced by many factors. If the proportion of calcium and phosphorus in food is unbalanced, too much or too little calcium or phosphorus may affect their absorption rate and ultimately affect the growth and development of bones, so the proportion of calcium and phosphorus in food should be appropriate. Calcium and phosphorus are the most abundant mineral elements in human body. They mainly form bones and teeth in the form of salt, which makes bones have special hardness and strength. The ratio of calcium and phosphorus content in bones is 2:1. The blood calcium level in human body mainly depends on the supply of calcium and the release of bone calcium. When the human body is short of calcium, it is first manifested in plasma. Because of the low calcium in plasma, the body has to use the calcium stored in bones in order to maintain the normal functioning of various physiological functions. If the body is often short of calcium, metabolic disorder will occur, leading to diseases such as osteoporosis and osteomalacia. Generally speaking, the ratio of 1: 1 ~ 2: 1 for adults and 1.5:1 for infants (under 1 year old) is the most favorable for calcium absorption. When the ratio of calcium to phosphorus in food exceeds 1:3, it is a high-phosphorus diet, and the absorption of intestinal calcium decreases when eating high-phosphorus diet.