This study aims to realize the large- scale and efficient development of the Taiyang shallow shale gas and provide a reference for the shallow shale gas exploration in other areas. To achieve this objective, the tectonic fault system, roof and floor conditions, sedimentary facies, high quality shale distribution, hydrocarbon storage conditions and the law of enrichment and high yield in the Taiyang region are systematically analyzed. Five characteristics of the proposed “three- dimensional closed system” compartment accumulation model of mountain shallow shale gas in the Taiyang anticline are: ① The overlying thick layer of dense shale and marlstone of the second sub- segment of the first member of the Longmaxi Formation to the Shiniulan Formation, and the underlying thick layer dense nodular limestone of Linxiang and Baota Formations, form a good barrier conditions of roof and floor of the compartment. ② The fault system, formed against a background of compressive and torsional stress, belongs to compressional thrust fault and compression- torsional strike- slip fault with good longitudinal sealing, which effectively protects high quality shale gas reservoir. ③ The lithology of the connection between the two sides of shale gas layers on the fault is dense marl and limestone. There is no leakage point for shale gas because of the good lateral sealing of the fault, so the mountain shallow shale gas still has the characteristics of continuous gas reservoir. ④ The “water retention+volcanic ash deposition” in foreland basin created the deep- water shelf sedimentary environment of “flourishing marine floating organisms+anoxic strong reduction”, formed the high- quality hydrocarbon source rock reservoir with “rich carbon, high silicon, low viscosity and high fragility”, and constructed the shale micro- nanometer reservoir pore space with “large- scale hydrocarbon generation and efficient adsorption and enrichment”. ⑤ The shale reservoir has relatively low in- situ stress and two- direction horizontal stress difference, which is not only conducive to the fracturing operation of the reservoir under medium and low pump pressure, but also has the key factors for fracturing the shale to form complex fracture network and gas well to obtain high yield. Based on these results, the law of “Four enrichment and high yield” of the shallow mountain shale gas in the complex structure area is achieved: the deep water anoxic and strong reduction environment in foreland basin promotes the development of carbon- rich, high- silicon and low- viscosity shale reservoirs (sediment controls reservoir); the continuous good three- dimensional closed storage box system effectively protects the hydrocarbon generation, hydrocarbon retention, hydrocarbon enrichment and overpressure pore protection of organic rich shale (preservation controls gas); shale brittleness, in- situ stress and horizontal stress difference determine the difficulty of SRV fracturing and affect the construction effect of artificial shale gas reservoir (stress controls occurrence); the continuous thickness and formation pressure coefficient of class I high- quality shale gas reservoirs determine the resource and reserve abundance of shale gas and the high production of gas wells (hydrocarbon reservoir control production). The research results are of great significance for the efficient exploration and development of shallow marine shale gas in the complex tectonic area in South China.