Higher bone density means that the bone density of an individual is at a relatively high level in the same age and gender, that is, the bone density of an individual is higher than that of most people of the same gender and age, that is, the bone density is higher. This situation is mainly compared with people of the same sex and age is not an absolute value, but the position occupied in the bone density distribution map. That is, after the detection of bone density image or value, in this age, this gender population bone density distribution chart in a high position, is high bone density, are compared with a certain population, is not an absolute value, can only say that bone density in the same sex, the same age of the population occupies the advantage.