Temperature Measurements made in connection with the formation of tungsten veins of the Nanling Eange, South China show that wolframite might be formed at about 400-300℃ (Tabl. I), and that the main mineralizing stage should take place at about 500-300℃, forming a hypothermal deposit. Topics dealt with herein include 1) the relationship of ore-forming temperature to granite bodies produced in the Yen-shan movement; 2) temperature variations marked at various types of vein-deposit,-and 3) the effect of ore-forming temperature on the sequence of deposition of various-minerals concerned during the main mineralizing stage (Fig. 1). Problems such as the zonal distribution of ore and the channel for circulation of ore solution are also discussed.