The unit of calcium and blood phosphorus is the molar concentration (mol/L), the original unit is the hundredth milligram (mg/dl), and the unit of calcium and phosphorus product is the hundredth milligram. Normally, the product (Ca) × P) of the two is 30-40mg/dl. If it is >40, calcium and phosphorus are deposited in bone tissue in the form of bone salt formality. If it is less than 35, bone calcification disorder, and even bone salt dissolution.