The difference between oligozoospermia and weak spermatozoa is as follows: 1. Oligospermia: refers to a low sperm count, and is considered oligozoospermia when the sperm concentration is less than 15 million/ml. When the total number of sperm is less than 39 million in each sperm collection, it can also be considered as oligozoospermia; 2. Weak Spermia: refers to the low activity rate of sperm, low vitality, forward-moving sperm is less than 32% when it is considered to be weak spermatozoospermia; if the activity rate of sperm is less than 40%, it can also be considered as weak spermatozoospermia. Whether it is oligospermia or weak spermatozoa, there is a difference between mild, moderate and severe, and there is also a big difference in treatment. Although oligospermia and hypospermia are both common causes of male infertility, they should be treated differently and have their own focus.