The main messenger that determines a man’s fertility is sperm, which is expelled from the body with semen during sexual intercourse. In order to understand male fertility, the most important test is semen analysis, preferably three times in a row. It focuses on analyzing the number of sperm within the semen and its function, usually using a computer-controlled automatic analysis device. As the farmer brothers often say, before sowing the seeds, first order the “seeds”. However, many male infertility patients are often confused and confused by the pile of data when they are given a semen test. It is very important to learn to understand the semen test sheets. The amount of semen in an adult male is usually 2-6 ml. The freshly ejaculated semen is in a solid state and usually becomes a thin liquid state after 5-20 minutes, which is called semen liquefaction. If it does not liquefy in more than 60 minutes, it greatly limits the sperm’s mobility and can affect the sperm’s ability to conceive. The pH of semen is generally neutral and slightly alkaline, with a pH between 7.2 and 8.0. A too acidic or too alkaline state is not conducive to sperm survival and physiological functions. If the sperm density is less than 20 million per milliliter, the sperm are too few, which is medically called oligospermia, and the conception rate will drop significantly. It is best to check the number of motile sperm at more than 60%, among which the sperm with straight and fast movement are the most likely to have the ability to conceive, and the more the better, generally it should be more than 25%. The number of sperm with normal morphological development should be at least 15%, and the number of sperm with deformity should preferably not exceed 85%. Checking the presence of white blood cells in semen can indirectly reflect the presence of local infection and inflammation, such as epididymitis or prostatitis, the higher the number of white blood cells the worse, and the number of white blood cells should not exceed 5/HP under normal circumstances.