Abstract: With introduction of the fluid compartment theory, this paper discusses the relations between abnormal pressure and fluid compartment and establishes the fluid compartment model. Based on analysis of source rock buried history, structural thermal development history, secondary porous and fractural development history, diagenetic trap history and natural gas migration and accumulation history and combined with the homogenization temperature of gas-liquid inclusions and authigenicillite K and Ar isotopic dating data, the time for development of He-8 and Shan-1 gas reservoirs of Sulige Gas Field in Ordos Basin is determined as Late Jurassic – Early Cretaceous. The paper also summarizes the natural gas accumulation and development pattern in the study region on the basis of the above-mentioned conclusion. It makes a comprehensive study of the natural gas accumulation elements in the study region, such as sourcing, reservoir, capping, sealing, migration and storage. The summarized natural gas abundance law indicates that sourcing intensity controls natural gas abundance degree while the favorable migration channels are the basic paths for natural gas migration. The physical properties of reservoir are the key factors to influence natural gas abundance.