As one of the major exploration target zones, the Qianjiang formation contains abundant oil resources, but the study on hydrocarbon accumulation dynamic system is very weak, restricting the exploration progress. Under the direction of dynamic system of hydrocarbon migration and accumulation theory and method, the dynamic system for hydrocarbon migration and accumulation of the Qianjiang formation in the north of Qianjiang depression is identified and classified. On the basis of tectonic-edimentary cycle, and through the source-reservoir-seal assemblage, traverse distribution characteristics of uncompacted belt, oil and gas source and strata sealing property analysis, the Qianjiang formation in northern Qianjiang depression is divided into four dynamic hydrocarbon accumulation subsystems：lower self-source overpressure and semi-enclosed subsystemⅠ, lower mixed-source overpressure and semi-enclosed subsystem Ⅱ, middle mixed-source overpressure and semi-enclosed subsystem Ⅲ and upper allo-source constant pressure and semi-open subsystem Ⅳ.The accumulation model in the study area can be subdivided into several types such as internal-lateral migration-multistage accumulated model, compound source-vertical and lateral migration-multi-stage accumulated model and external source vertical and lateral migration-multi-stage accumulated model.