Normal sperm percentage of 4.5 refers to normal sperm morphology, no deformities, generally through the semen examination can clarify the specific situation, the decline in the normal proportion of sperm is easy to affect the conception, simple sperm morphology abnormalities can be adjusted to improve the lifestyle. The percentage of normal spermatozoa is currently defined according to the fifth edition of the WHO, and is considered normal if it is greater than or equal to 4%. The normal percentage of sperm includes sperm count and sperm density, which can be clarified through semen examination. The lower the normal percentage of sperm, the lower the chance of conception. In the case of simple sperm morphology abnormality and increased malformation rate, most of them can be significantly improved by adjusting lifestyle habits, such as stopping smoking and drinking alcohol, and strengthening exercise. A normal sperm percentage of 4.5 means that the spermatozoa have a normal morphology, and it is recommended that you go to the hospital in time when abnormalities occur.