Abstract: Multi-stage fracturing in horizontal well is a great way to improve the oil recovery of shale oil reservoir. Therefore, it is important to establish a reliable method for accurate fracturing parameter evaluation in multi-stage fractured horizontal wells. Based on the actual well test data and pressure derivative curves, a stimulated reservoir volume（SRV）model considering both the main and secondary fracture networks is established for multi-stage fractured horizontal wells in shale oil reservoirs, and the type curves of the bottom hole pressure difference and its derivative of the model are analyzed, which are mainly composed of six stages: wellbore storage effect stage, skin effect stage, bilinear flow stage of main and secondary fracture networks, linear flow stage in secondary fracture network, interporosity flow stage in fracturing treatment zone and pseudosteady-state flow stage. The sensitivity analysis of parameters shows that the larger the storage ratio, the smaller the sinking amplitude of the pressure difference derivative curve; the longer the fracture half-length, the longer the duration of the bilinear flow phase on the pressure derivative curve and the shorter the duration of the linear flow stage, and the pressure difference and its derivative curves of the pseudosteady-state flow stage are shifted downward. Based on this model, a well test analysis method for fracture evaluation of multi-stage fractured horizontal wells in shale reservoirs is proposed. The actual example shows that this model can effectively fit the actual well testing data. The actual production data and pressure coupling analysis verify the accuracy of the results. This method can be applied in fracturing parameter evaluation in other similar shale oil reservoirs