The invention discloses an extraction and expression mode of a pain component in brain waves. The extraction and expression mode is a method for extracting characteristic components of feelings related to pains, labor pains, anxiety, tension, delirium, oblivion and comfort in the brain waves by acquiring a brain wave signal in real time and utilizing a mathematic calculation algorithm of discrete signal processing, and the method is expressed into an expression mode of dimensionless data of 0-100. By utilizing a signal sensing technology of electrophysiology to acquire a brain wave signal and calculate and analyze the signal, the characteristic index is found and extracted, through normalization processing, a quantitative numerical value for measuring the characteristic index is obtained, and technical means and application equipment for real-time pain measurement are formed. According to the extraction and expression mode of the pain component in the brain waves, a powerful support means is provided for scientific study of pain treatment and a management method, and the extraction and expression mode has important practical value in the aspects of analyzing a medicine curative effect, summarizing a treatment method, adjusting a treatment scheme, studying and analyzing a pain mechanism, collecting large sample long-time clinical pain relevant information and the like.