Semen is composed of two parts: seminal plasma and spermatozoa. Among them, seminal plasma contains a variety of biochemical components and inorganic elements, some of which reflect the functions of specific organs of the male reproductive system and provide a suitable physicochemical environment for sperm survival and the energy required for sperm movement; some components, such as epididymal maturation factor and coagulation factor, are closely related to sperm function. Some components, such as epididymal maturation factor and coagulation factor, are closely related to sperm function. globulin, etc.; enzymatic proteins, including acid phosphatase, hyaluronidase, glycosidase, fibrinogen activator, etc.; 5, peptide hormones, such as FSH, LH, prolactin, etc.; 6, amines, such as spermidine, spermidine, spermine, etc.; 7, amino acids, such as spermidine, glutamate and other amino acids; 8, organic acids and organic bases, such as citrate, carnitine, glycerophosphorylcholine, lactic acid, etc.; 9, Inorganic ions, such as zinc, magnesium, calcium, copper, potassium, chloride, sodium, etc.; Among them, fructose, carnosine, citrate, glycerophosphorylcholine, glycosidase, spermine and other substances in seminal plasma may appear abnormally high or low under special circumstances, thus suggesting that the reproductive tract may have certain diseases.