Aim\ To study the toughness of the fibre reinforced concrete. Methods\ The shapes of fracture process zones in notched concrete beam and notched fibre reinforced concrete beam are researched by means of laser speckle photography. Results\ The whole process of microcracks appearance before the occurrence of unstable fracture

and the load vs. and crack tip opening displacement curves are ditermined. Conclusion\ The shapes of fracture process zones are long

narrow and irregular bands. The length of subcritical growth for main crack

the critical crack tip open displacement and the toughness of the material are increased by adding fibre

because the growth of microcracks zone is restricted by fibre.