Abstract: The stress redistribution of fibers immediately adjacent is examined to a broken high modulus fiber in an intermingled hybrid composite. The problem was formulated by establishing the proper analysis model, and the solutions of two-dimensional elastic mechanics in conjunction with the Fourier transform were adopted to set up the singular integral equations for this problem. From the solution of these equations, the stress concentration factors(SCF) were evaluated for the high and low modulus fibers and matrix. The numerical analysis results provide a theoretical explanation of the observed"hybrid effect".Compared with the existing Shear-Lag theory results, the present analysis results are more accurate and reasonable, and can be used in the design of intermingled hybrid composites.