Daan area along the Nenjiang river is an important area of the Jilin oil field. The analysis of the hydrocarbon accumulation model is the basis of fine geological studies. The petroleum accumulation pattern of Putaohua reservoir in Daan area along the river is established by using the ‘source control theory’ and a comprehensive study of the static elements, including the source, the reservoir, the cap rocks, and the dynamic processes, including the generation, the expulsion, the migration, the accumulation and the dispersion. The hydrocarbon accumulation patterns and the controlling factors of the hydrocarbon accumulation in the target area are revealed through the study of the buried history of the source rocks, the paleostructural evolution history, the migration and accumulation field of the hydrocarbon, and the oil-water distribution in the Putaohua reservoir in Daan area along the Nenjiang river. It is shown that the hydrocarbon of the Putaohua reservoir is mainly derived from the underlying source rocks of the Ⅰ segment of the Qingshankou Group, in Qijia-Gulong depression of the north area. The oil is generated and exhausted from the Qingshankou Ⅰ segment, followed by the accumulation into the Putaohua reservoir which is connected by the fault to the Qingshankou Ⅰ segment, under the force of buoyancy.