The standard for normal sperm morphology rate is that >4% of normal morphology spermatozoa are required, i.e., all parts of the head, neck and tail need to be normal in morphology. Normal male spermatozoa are tadpole-like in shape, consisting of three parts: head, neck and tail. The head is ovoid, with a clear acrosome boundary, accounting for 40% to 70% of the head; the neck of the spermatozoon is very short, connecting between the head and the tail; the tail is long and thin, flagellate, and gradually thinning towards the tail end. It takes >4% of sperm in normal form to be observed under a microscope. When any part of the sperm is abnormal, it is considered morphologically abnormal and can cause male infertility, which needs to be actively treated under the guidance of a doctor.