本文在前人资料的基础上,根据我们所做的熔化实验结果,论述了个旧花岗岩的形成条件,探讨了它们的成因机理,提出了初步的评价标志.不当之处,请批评指正.一、实验方法实验样品系采自个旧地区龙岔河、马松、老卡、白沙冲等岩体中有代表性的五种花岗岩以及龙岔河、马松等岩体中有代表性的两种“暗色包体”,它们的岩石特征和化学成分列于表1、4. On the basis of the previous data, based on the results of the melting experiments we made, this paper discusses the formation conditions of Gejiu granites, discusses their genesis mechanism and puts forward the preliminary evaluation signs. Experimental Methods The experimental samples were collected from five representative granites in the Longchahe, Mason, Laojia, Baishachong and other rock masses in Gejiu area and two representatives of the “ Dark inclusions ”, their rock characteristics and chemical composition are listed in Table 1, 4.