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This paper presents the characteristics of flexural behavior of RC slab strengthened with CFRP Grid (Carbon Fiber Reinforced Polymer Grid). Parameters involved in this experimental study are CFRP Grid reinforcement quantity, Strengthening length, compressive strength of concrete. In this study there are various failure types with increasing the strengthening reinforcement. On the moderate strengthening level, there is a failure in the interface of carbon FRP Grid because of the excessive shear deformation. On the other hand, there is a failure in shear on the high strengthening level. With the increasing of FRP grid reinforcement, the strengthening effect in flexure increased, but the ductility decreased. On the basis of premature failure mechanism in RC slab bonded with CFRP Grid, Basic strengthening length and Premature failure criteria were derived.