Most cathodoluminescence imaging studies are focused on zircons separated from rock samples. However, it is difficult for this method to reveal origins of zircons with complex formation and evolution histories. In order to overcome the shortage and better understand the influence of the environment on zircons, the authors carried out cathodoluminescence study of zircons in thin sections for three metamorphic rock samples from Daqingshan, a typical area of extensively distributed high-grade metamorphic rocks. The main conclusions are as follows: ① Zircons occurring as enclaves in rock-forming minerals, such as quartz and feldspar, have rare overgrowth rims but can undergo recrystallization in different degrees. ② Fluid is very important for the recrystallization of zircons and overgrowth, and can be derived outside or inside the rock system. ③ It seems that some recrystallized zircons were wrongly regarded as overgrowth rims in previous studies.