The geotectonic unit of Shenmulei original ecological scenic spot is located in the Songpan Ganzi fold system, belonging to the southern margin of the Barkam syncline of the ba-yan 'Kalamao geosyncline fold belt, it consists of a series of arc-shaped south-facing linear folds in close coordination with each other, forming a nearly east-west or north-west spreading structural belt with relatively complete strata, from the old to the new: Ordovician, Silurian, Devonian, carboniferous, Permian, triassic, quaternary, to the triassic before the older rocks mainly, the mountains are mostly composed of metamorphic rocks, granite.