Abstract: In recent years, a new type of oil reservoir, with reserves of 1 billion tons, has been discovered in the low uplift of Shuntuoguole in the Tarim Basin - ultra-deep fault-karst oil reservoir in the Shunbei area. By deepening understanding of the geological conditions for oil and gas accumulation in the Shunbei area, the constraint on development represented by the fact that karst reservoirs had not been developed in the lower structure positions has been broken. It is also proposed that large-scale reservoirs can be formed by later superimposed buried fluid reformation, mainly due to structure fracturing of strike slip fault zones. The multi-stage activities of strike slip fault zones play an important role in controlling reservoir reformation, trap formation and hydrocarbon migration and accumulation. The hydrocarbon accumulation mode of "multi-stage hydrocarbon supply in Cambrian, deep buried fault-karst reservoir, in-situ vertical migration, mainly late stage accumulation, strike slip faults controlling enrichment" has been established for ultra-deep fault-karst reservoir in the Shunbei area. The main controlling factors of enrichment of the fault-karst reservoir have been presented. As a new type of reservoir, ultra-deep fault-karst reservoir has extended the theory of hydrocarbon accumulation in marine carbonates, confirms the great exploration potential of ultra-deep marine carbonate formations, and is the key field for reserves increase in the future.