The Human body is an aggregate of numerous cells, which continuously grow and develop, split, regenerate and die. By splitting up, cells renew themselves. For adult people, about 25 million cells are splitting up every second and blood cells are constantly renewing at a rate of about 100 million per minute. In the process of cellular split-up and renewal, the charged bodies of nucleus and extranuclear electrons as the basis unit of a cell are moving and changing ceaselessly at a high speed as well, emitting electromagnetic waves without interruption. The signals of electromagnetic waves emitted by human bodies represent the specific condition of human body and therefore, different signals of electromagnetic waves will be emitted by the conditions of good health, sub-health, diseases, etc. The conditions of life can be analyzed if such specific electromagnetic wave signals can be analyzed.