Located in the northern Shizishan orefield of Tongling area, Anhui Province, the Dongguashan skarn copper deposit is a typical stratabound skarn copper deposit in China. Based on field survey and microscope observation, the authors found that garnet in the Dongguashan copper deposit can be divided into two stages: stageⅠ garnet and stageⅡ garnet. The results show remarkable differences between them: the andradite component of stageⅠgarnet is higher, which is up to 94.14%, stage Ⅱ garnet is Al-rich, its grossular component is up to 44.06% . The features indicate that the first stage garnet is of magmatic genesis and were formed in oxidizing conditions, whereas the second stage garnet is of hydrothermal metasomatic genesis and was formed in a reductive environment.