Spermatozoa are produced by the testes and make up a small part of the semen. The majority of the semen is seminal plasma, which can provide some nutrition for spermatozoa. The time of sperm survival in vitro is not an absolute value. Generally speaking, for intravaginal ejaculation, sperm can survive for 48 to 72 hours, and for in vitro ejaculation, they can survive for 3 to 4 hours at room temperature, and if it is a dry environment, etc., the survival time will be greatly reduced. Clarifying the time of sperm survival outside the body has two main meanings: 1. To be able to grasp the situation after ejaculation by yourself, you can prepare for conception according to the ovulation period of your sexual partner, and if the couple does not conceive for a long time, you should seek medical examination in time to check the quality of sperm, mainly looking at the quantity as well as the activity of sperm, find the cause and target treatment. 2, semen is a kind of body fluid, can spread some infectious diseases, such as sexually transmitted diseases, AIDS, etc., daily attention to sexual hygiene, avoid unclean sex, do their own protection work, avoid body wounds contact with body fluids of unknown origin, reduce the chance of infectious disease infection. In short, daily attention to regular diet, to avoid the stimulation of alcohol and tobacco, and appropriate more oysters and other foods, can supplement the zinc element, for the improvement of sperm quality is very helpful.