Weak spermatozoa is defined as less than 32% of forward-moving spermatozoa; oligospermia is defined as a total number of spermatozoa less than 39 x 10^6 per ejaculate. Weak spermatozoa refers to low sperm motility, and according to the latest semen examination manual of the World Health Organization, the percentage of forward-moving spermatozoa is less than 32% as weak spermatozoa. Oligospermia refers to low sperm concentration and low semen output in a single ejaculation. According to the regulations, a total sperm count of less than 39×10^6 spermatozoa per ejaculation is considered oligospermia. Weak spermatozoa and oligospermia are usually diagnosed through semen examination, which plays an important role in evaluating male fertility, diagnosing the causes of infertility and diseases of the reproductive organs, and it is a routine examination for men before childbearing. There are many causes of weak spermatozoa and oligospermia, such as bad lifestyle habits, varicocele, environmental influences, etc. If abnormalities are found, please follow the doctor’s advice for regular treatment.