Applied load is inciting numerous cracks formation in fiber reinforced concrete (FRC) structural member. Fibers are bridging the crack. Fiber pulling out micromechanics is governing the macro-crack opening process. Post cracking load -bearing capacity is dependent on the each single fiber as well as fibers bundle pull-out process. In the present paper are presented numerical simulations and experimental investigations results of a single and few non-metallic fibers were embedded into concrete matrix and were subjected to external applied pulling load. Numerical modeling was performed using 3D FEM approach. Experimental data analysis shown that the pull-out process for single fiber can be divided into three stages- a) fiber pull-out with perfect bond between fiber and concrete matrix; b) fiber pull-out with partial debond (cylindrical crack) between concrete matrix and fiber, started from concrete matrix surface; c) fully debonded fiber pull-out of concrete matrix. All above mentioned stages were investigated theoretically and experimentally. Few fibers bundle has “telescopical” pull-out mechanism if it is not penetrated by concrete properly.