The micromechanics of the rupture of Haversion cortical bone has been pointed out, the microcracks form in Haversion cortical bone owing to fatigue load and cyclic load. Based on twodimensional micromechanical fibreceramic matrix composite tissue material model, some researchers study the interaction between osteon and their cracks according to any radial vertical rupture in interstitial lamella. In order to more practical simulate bone rupture, this paper mainly studies that a straight line rupture simultaneously appears in osteon and interbone lamella, regards cracks as a series of continuous edge dislocation pileup group, then uses Green function to transform them into a series of singular integral equations, then uses Erdogon and Gupta method to solve the equations, uses GaussianChebyshev numerical discrete method to obtain corresponding stress intensity factor and analyzes the influence on bone microstructure morphology.