The shale, due to its laminated structure, presents special multiscale fracture behaviours. To study the multiscale fracturing properties of shale, the microstructure of shale is scanned and the nanoindentation technique is adopted to measure the mechanical properties of mineral grains, cementation and interfaces. Then, according to the microstructure and micro properties of shale, an elaborative micro mechanical model is built up by using the discretized virtual internal bond. Through this elaborative model the mechanical behaviours are simulated in order to investigate the macro response of a shale. Based on the simulation results, the continuous virtual internal bond is adopted to model the shale. By this continuous virtual internal bond model, the macro mechanical properties and fracture behaviours of shale can be well simulated. It can provide an alternative mechanical model for the hydraulic fracture simulation in shale reservoir stimulation.