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滇中地区前地槽构造层可以细分为活动构造层和“稳定”构造层，分别以哀牢山群及大红山群老厂河组为代表．它们是原陆壳活动阶段和原陆壳“稳定”阶段的产物．原陆壳活动阶段与地槽和地洼２个活动阶段在构造层分布特征、物质来源、沉积建造、岩浆建造、构造变形和区域变质作用等方面存在明显的区别．原陆壳“稳定”区已经初步具备陆壳特征，沉积区属于稳定的浅海，其沉积物来源于同期的稳定陆岛．
The pre-geosyncline structural layer in the central Yunnan area can be subdivided into active tectonics and “stable” structural layers, represented by the Ailao Mountain Group and the Dachanghe Formation of the Dahongshan Group, respectively. They are the product of the active stage of the original continental crust and the “stable” stage of the original continental crust. There are obvious differences in the activities of the original continental crust, the tectonic distribution, the source of sediments, the sedimentary construction, the magmatic construction, the tectonic deformation and the regional metamorphism in the two active stages of the trough and diwa. The “stable” zone of the original crust has been initially characterized by the continental crust. The sedimentary area belongs to the stable shallow sea and its sediments originate from the stable land islands of the same period.