Based on the innovative practice of exploration, discovery and evaluation of Taiyang shallow shale gas field in Zhaotong Demonstration Area, the basic geological characteristics and enrichment law of mountainous shallow shale gas field in strong reconstruction and complex structural area are systematically summarized. It is pointed out that 30-40 m thick high-quality shale is developed in O3w (Wufeng Formation) - S1l11-1(first sublayer of Longmaxi Submember 11) of Taiyang shallow shale gas field. The geochemical characteristics show that the TOC of high-quality shale is generally greater than 2.0，, the type of organic matter is II1, and the macerals are mainly sapropelic. The maturity of organic matter (Ro) is among 1.65，-3.11，, with an average of 2.54，, belonging to the dry gas generation stage of over mature, which provides a good material basis for the generation of a large amount of shale gas. The reservoir conditions are superior, and various types of pores are developed, with porosity ranging from 2.04， to 10.06，. The pores dominated by organic matter pores and clay mineral interlayer fractures provide a large amount of reservoir space for shale gas. The gas content of the target layer generally increases with the increase of depth. The average adsorbed gas content of shale in O3w- S1l11-1 measured by methane adsorption experiment is 1.92 m3/t, which proves that the adsorbed gas accounts for a large proportion of shallow shale gas. Moreover, the trace strength of structural transformation is generally weak, which is conducive to the formation of a complete three dimensional sealed box system with the characteristics of roof and floor with good vertical sealing performance, reverse fault with good lateral sealing performance and shale reservoir with strong self-sealing performance. Therefore, the overall preservation conditions of the target layer are good, with high gas content and atmospheric pressure to micro overpressure system. Shale has high content of brittle minerals and small horizontal