1. At high temperature, (34f33 after mounting) the male accessory glands showed adnormal shapes, shorter length and lighter dry weight. 2. High temperature caused changes in the histological structure, such as damaged nuclear system, nonhomogenous nucleoplasm, broken rough endoplasmic reticulum, damaged mitochondria. 3. The DNA and RNA contents decreased. 4. The compositions of protein and amlno acid in the secretion were changed and (heir contents decreased. 5. The activity of motile sperms varied with the duratJon of the high temperature treatment, the longer the time, the weaker the activity and hegher the percentage of unfertilized eggs.