The normal value for sperm morphology is 4%, which is used to assess the percentage of sperm that can be used for fertilization. The original normal value for sperm morphology was 16%, but now it has been reduced to 4%, mainly due to the increasing sophistication of sperm morphology testing instruments, which has led to a more rigorous assessment of sperm morphology, but this does not mean that there is a decrease in fertility. The significance of sperm morphology is to assess the morphology of the sperm. 96% of sperm with abnormal morphology are mainly malformed in the head, which makes it difficult for such sperm to unite with the egg to achieve fertilization, so sperm morphology can be used to assess the percentage of sperm that can be used for fertilization. Although only 4% of sperms can be used for normal fertilization, there is no need to worry too much about the results of sperm morphology assessment since a normal male can have 35 million sperms in one ejaculation.