Abstract: The mechanical property test on a metal-matrix composite (MMC) requires a high degree of statistical reliability in its experimental data due to the structural peculiarity of the material,hence a great number of specimens.This requirement,on the other hand,implies a high cost for the test considering the cmplexity in fabricating the material.It is,consequently,desirable that an economical method should be found to analyse and evaluate the mechanical properties,especially the fracture behavior,of MMC.Computer-simulation,as such an answer,was used in the present investigation to probe the fracture process of a unidirectional fibre-reinforced MMC in tension of a two-dimensional sheet with tensile axis parallel to the fibres.The ltey stage of the simulation was to establish an analytical model on which the computer program was based.The modelcombined fracture mechanics with statistics.It mainly consisted of the distribution of a fibre's ultimate strength,the statistical sequence for simulation and the stress intensification ahead of a broken fibre.Weibull's Distribution Function of probability was found to be a valid function in demonstrating the scattering character of the fibre's ultimate strength.And,Monte Carlo's Statistical Testing Method was utilized and extended to generate a stochastic sequence for distributing the strength value and forming the simulation sequence.