Abstract: The efficient development of shale gas reservoirs was closely related to rational design of stimulated reservoir volume.On the basis of extensive literature research,a detailed overview of the numerical simulation techniques of volume fracturing in unconventional oil reservoirs was obtained.From the interaction between natural fractures and hydraulic fractures and the stress shadow and proppant simulation,the development of fracture mechanics model was described,and rhe principle of unconventional fracture model was introduced,which provided a good reference for further study.Besides the continuum medium model and discrete fracture network model in numerical simulation of volume fracturing in unconventional oil reservoirs were also described,the principles,ideas and applicability of numerical simulation were analyzed.Finally,the main direction of foreign research was summarized and further development of the numerical simulation for tight oil reservoirs in Changqing oilfield was put forward.